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Class 11 Geography Notes Chapter 2 The Origin and Evolution of the Earth

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Class 11 Geography Notes Chapter 2 The Origin and Evolution of the Earth

Many hypotheses were put forth by different philosophers and scientists regarding the origin of the earth.

One of the earlier and popular arguments was by German philosopher Immanuel Kant which was revised by mathematician Laplace in 1796. It is known as Nebular Hypothesis. According to this hypothesis the planets were formed out of a cloud of material associated with a youthful sun, which was slowly rotating.

In 1900, Chamberlain and Moulton considered that a wandering star approached the sun. As a result, a cigar-shaped extension of material was separated from the solar surface. As the passing star moved away, the material separated from the solar surface continued to revolve around the sun and it slowly condensed into planets. Later on, the arguments considered of a companion to the sun to have been coexisting. These arguments are called binary theories.

The most popular argument regarding the origin of the universe is the Big Bang Theory. It is also called expanding universe hypothesis. The Big Bang Theory considers the following stages in the development of the universe.

  • In the beginning, all matter forming the universe existed in one place in the form of a“tiny ball” (singular atom) with an unimaginably small volume, infinite temperature and infinite density.
  • At the Big Bang the “tiny ball” exploded violently. This led to a huge expansion. It is now generally accepted that the event of big bang took place 13.7 billion years before the present.
  • Within 300,000 years from the Big Bang, temperature dropped to 4,500 K (Kelvin) and gave rise to atomic matter. The universe became transparent.

A galaxy contains a large number of stars. Galaxies spread over vast distances that are measured in thousands of light-years. The diameters of individual galaxies range from 80,000-150,000 light years.

Akash Ganga or the milky way, our galaxy started to form by accumulation of hydrogen gas in the form of a very large cloud called nebula. Eventually, growing nebula develops localised clumps of gas. These clumps continue to grow into even denser gaseous bodies, giving rise to formation of stars. The formation of stars is believed to have taken place some 5-6 billion years ago.

Our Solar system consists of eight planets. The nebula from which our Solar system is supposed to have been formed, started its collapse and core formation some time 5-5.6 billion years ago and the planets were formed about 4.6 billion years ago. Our solar system consists of the sun (the star), 8 planets, 63 moons, millions of smaller bodies like asteroids and comets and huge quantity of dust-grains and gases.

The Solar System:
Class 11 Geography Notes Chapter 2 The Origin and Evolution of the Earth 1
Class 11 Geography Notes Chapter 2 The Origin and Evolution of the Earth 2
The moon is the only natural satellite of the’ earth. It is now generally believed that the formation of moon, as a satellite of the earth, is an outcome of ‘giant impact’ or what is described as “the big splat”. A bbdy of the size of one to three times that of mars collided into the earth sometime shortly after the earth was formed. It blasted a large part of the earth into space. This portion of blasted material then continued to orbit the earth and eventually formed into the present moon about 4.44 billion years ago.

There are three stages in the evolution of the present atmosphere. The first stage is marked by the loss of primordial atmosphere. In the second stage, the hot interior of the earth contributed to the evolutipn of the atmosphere. Finally, the composition of the atmosphere was modified by the living world through the process of photosynthesis.
10. Sometime around 3,800 million years ago, life began to evolve. However, around 2,500-3,000 million years before the present, the process of photosynthesis got evolved. Life was f confined to the oceans for a long time.

Geological Time Scale:
Class 11 Geography Notes Chapter 2 The Origin and Evolution of the Earth 3
Class 11 Geography Notes Chapter 2 The Origin and Evolution of the Earth 4

The record of life that existed on this planet in different periods is found in rocks in the form of fossils. The microscopic structures closely related to the present form of blue algae have been found in geologicad formations much older than some 3,000 million years. It can be assumed that life began to evolve sometime 3,800 million years ago.

Class 11 Geography Notes Chapter Important Terms:

  • Light Year: A light year is equal to the number of kilometers traveled by light per second. It is a measure of distance and not of time. Light travels at a speed of 300,000 km/second. Therefore, the distances the light will travel in one year is taken to be as one light year.
  • Planetesimals: The gas cloud starts getting condensed and the matter around the core develops into small- rounded objects. These small-rounded objects by the process of cohesion develop into what is called planetesimals.
  • Universe: All matter, energy, heavenly bodies, and all that is there in space is as a group called the universe.
  • Galaxy: Galaxy is a cluster of millions of stars and solar systems.
  • Outer Planets: Jupiter Saturn Uranus Neptune and Pluto are called Outer Planets.
  • Inner Planets: Mercury ,Venus, Earth and Mars are called Inner Planets.
  • Big Bang Theory: The Big Bang Theory, also called as expand universe hypothesis. Edwin Hubble in 1920 provided the evidence that the universe is expanding. This theory is most universally accepted regarding origin of the earth.
  • Binary theory: It is the principle of the origin of the earth given by Chamberlain and Moulton.
  • Solar System: It consists of the sun, planets and their satellites and various other smaller heavenly bodies such as asteroids, comets and meteors.
  • Nebular Hypothesis: It was a theory related to origin of the earth given by Immanuel Kant in 1755 and revised by Laplace in 1796.
  • Nebula: Slow circular moving gaseous clouds are called nebula.
  • The big splat: The origin of the moon as a satellite of the earth is the result of big collision which is called “the big splat”.
  • Differentiation: The process through which the earth forming material got separated into different layers is called differentiation.
  • Dwarf Planet: According to International Astronomical Union (IAU) on August 24,2006, a planet is a celestial body that
    • orbits around the sun
    • has sufficient mass so that it assumes a hydrostatic equilibrium (nearly round) shape. The non-satellites bodies fulfilling these two rules are called dwarf planets. Pluto is now considered a dwarf planet. Ceres, Eris, Makemake, Haumea are some other dwarf planets.
  • Jovian: Jovian means jupiter-like.
  • Akash Ganga: Akash Ganga or milky way is the name of the galaxy to which our earth belongs.
  • Expansion of Universe: Expansion of universe means increase in the distance between galaxies.

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 3 Interior of the Earth

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Class 11 Geography Notes Chapter 3 Interior of the Earth

  • Gold mines in South Africa are as deep as 3 – 4 km. Going beyond this depth is not possible as it is very hot at this depth.
  • The earth’s radius is 6,370 km.
  • Earthquakes, volcanic eruptions and magma are major sources of the information on interior of the earth. The indirect sources include analysis of the information, meteors reaching the earth, gravitation, magnetic field, and seismic activity.
  • We get to know through mining activity that temperature and pressure increase with the increasing distance from the surface towards the interior in deeper depths. Moreover, it is also known that the density of the material also increases with depth. It is possible to find the rate of change of these characteristics.
  • The lithosphere refers to the portion of depth up to 200 km from the surface of the earth.
  • An instrument called ‘seismograph’ records the waves reaching the surface.
  • The velocity of waves changes as they travel through materials with different densities. The denser the material, the higher is the velocity.
  • Seismographic waves are of two types: P waves and S waves.
  • The seismographs located beyond 145° from epicenter, record the arrival of P-waves, but not that of S-waves.
  • A zone between 105° and 145° from epicenter was identified as the shadow zone for both the types of waves.
  • The entire zone beyond 105° does not receive S-waves. The shadow zone of S-wave is much larger than that of the P-waves. The shadow zone of P-waves appears as a band around the earth between 105° and 145° away from the epicenter.
  • Earthquakes are of two types: a) Tectonic earthquake and b) Volcanic earthquake.
  • The magnitude of earthquake is measured through Richter Scale. It relates to the energy released during the quake. The magnitude is expressed in absolute numbers, 0-10. The intensity scale is named after Mercalli, an Italian seismologist.
  • The Crust is the outermost solid part of the earth. It is brittle in nature. The thickness of the crust varies under the oceanic and continental areas. Oceanic crust is thinner as compared to the continental crust.
  • The mean thickness of oceanic crust is 5 km whereas that of the continental is around 30 km. The continental crust is thicker in the areas of major mountain systems. It is as much as 70 km thick in the Himalayan region.
  • The portion of the interior beyond the crust is called the mantle. The mantle extends from Moho’s discontinuity to a depth of 2,900 km.
  • The Core is the innermost portion of the earth. The core- mantle boundary is located at the depth of 2,900 km. The outer core is in liquid state while the inner core is in solid state. The depth of the core is from 2900 km to 6378 km.
  • Barring the basalt flows, the shield volcanoes are the largest of all the volcanoes on the earth. The Hawaiian volcanoes are the most famous examples.

Class 11 Geography Notes Chapter 3 The Origin and Evolution of the Earth 1

Class 11 Geography Notes Chapter 3 Important Terms:

  • Earthquake: An earthquake in simple words is shaking of the earth. It is a natural event.It is caused due to release of energy, which generates waves that travel in all directions.
  • Lithosphere: The lithosphere refers to the portion of depth up to 200 km from the surface of the earth,
  • Volcano: A volcano is a place where gases, ashes and/or molten rock material – lava – escape to the ground.
  • Active Volcano: A volcano is called an active volcano if the materials mentioned are being released or have been Released out in the recent past.
  • Magma: As long as liquid rocks arena the upper portion of the mantle, it is called magma.
  • Lava: When magma reaches the irust of the earth, it is called lava.
  • Intrusive Forms: The lava that, cools within the crustal portions assumes different forms. These forms are called intrusive forms.
  • Batholiths: A large body of magmatic material that cools in the deeper depth of the crust develops in the form of large domfss.’Batholiths are the cooled portion of magma chambers.
  • Caldera: These are the most explosive of the earth’s volcanoes. They are usually so explosive that when they erupt they fend to collapse on themselves rather than building any tall structure. The collapsed depressions are called calderas.
  • Lacoliths: These are large dome-shaped intrusive bodies with a level base and connected by a pipe-like conduit from below. It resembles the surface volcanic domes of composite volcano, only these are located at deeper depths.
  • Lapolith: As and when the lava moves upwards, a portion of the same may tend to move in a horizontal direction wherever it finds a weak plane. It may get rested in different forms.‘ In case it develops into a saucer shape, concave to the sky body, it is called lapolith.
  • Phacolith: A wavy mass of intrusive rocks, at times, is found at the base of synclines or at the top of anticline in folded igneous country. Such wavy materials have a definite conduit to source beneath in the form of magma chambers (subsequently developed as batholiths). These are called the phacoliths.
  • Sills: The near horizontal bodies gf the intrusive igneous rocks are called sill or sheet, depending on the thickness of the material. The thinner ones are called sheets while the thick horizontal deposits are called sills.
  • Hypocentre: The point where the energy is released is called the focus of an earthquake, alternatively, it is called the hypocentre.
  • Epicentre: The point on the surface which is nearest to the focus of energy is called epicenterIt is the first one to experience the waves. It is a point directly above the focus.
  • Crust: The Crust is the outermost solid part of the earth.
  • Mantle: The portion of the interior beyond the crust is called the mantle.
  • Gravity Anomalies: The difference in readings from the expected values is called gravity anomaly. Gravity anomalies give us information about the distribution of mass of the material in the crust of the earth.
  • Shadow Zone: There exist some specific areas where the waves are not reported. Such a zone is called the ‘shadow zone’.
  • Richter Scale: The earthquake events are scaled either according to the magnitude or intensity of the shock. The magnitude scale is known as the Richter scale.
  • Shield Volcanoes: These volcanoes are mostly made up of basalt, a type of lava that is very fluid when erupted. For this reason, these volcanoes are not steep.
  • Composite Volcanoes: These volcanoes are characterised by eruptions of cooler and more viscous waves than basalt. These volcanoes often result in explosive eruptions.
  • P-waves: P waves move faster and are the first to arrive at the surface. These are also called ‘primary waves’.
  • S-.waves: S-waves arrive at the surface with some time lag. These are called secondary waves .

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 4 Distribution of Oceans and Continents

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Class 11 Geography Notes Chapter 4 Distribution of Oceans and Continents

Continents cover 29% of the surface of the earth and the remainder 71% is under oceanic waters.

Alfred Wegener—a German meteorologist put forth a comprehensive argument in the form of “the continental drift theory” in 1912. This was regarding the distribution of the oceans and the continents.

According to Wegener, all the continents formed a single continental mass and mega ocean surrounded the same. The super continent was named PANGAEA, which meant all earth. The mega-ocean was called PANTHALA5SA, meaning all water.

Wegener argued that, around 200 million years ago, the super continent, Pangaea, began to split. Pangaea first broke into two large continental masses as Laurasia and Gondwanaland forming the northern and southern components respectively. Subsequently, Laurasia and Gondwanaland continued to break into various smaller continents that exist today.

The radiometric dating methods developed in the recent period have facilitated correlating the rock formation from different continents across the vast ocean.

The ocean floor may be segmented into three major divisions based on the depth as well as the forms of relief. These divisions are continental margins, deep-sea basins and mid-ocean ridges.

Concept of sea floor spreading was proposed by Hess in 1981 who believed that new lava pushes out the plates from the mid-oceanic ridge

It was in 1967, McKenzie and Parker and also Morgan, independently collected the available ideas and came out with another concept termed Plate Tectonics.
Class 11 Geography Notes Chapter 4 Distribution of Oceans and Continents 1
India is supposed to have started her northward journey about 200 million years ago at the time when Pangaea broke. India collided with Asia about 40-50 million years ago causing rapid uplift of the Himalayas.

The theory of plate tectonics proposes that the earth’s lithosphere is divided into seven major and some minor plates.

Class 11 Geography Notes Chapter 4 Important Terms:

  • Convective flow: The heated material rises to the surface, spreads and begins to cool, and then sinks back into deeper depths. This cycle is repeated over and over to generate what scientists call a convection cell or convective flow.
  • PANGAEA: The super continent was named PANGAEA, which meant all earth.
  • PANTHALASSA: The mega-ocean was called PANTHALASSA, meaning all water.
  • Rim of Fire: The rim of the Pacific is also called rim of fire due to the existence of active volcanoes in this area.
  • Convergent Boundaries: Where the crust is destroyed as one plate dived under another, it is called convergent boundaries.
  • Subduction Zone: The location where sinking of a plate occurs is called a subduction zone.
  • Divergent Boundaries: Where new crust is generated as the plates pull away from each other, these are called divergent boundaries.
  • Spreading Sites: The sites where the plates move away from each other are called spreading sites.
  • Transform Boundaries: Where the crust is neither produced nor destroyed as the plates slide horizontally past each other.
  • Tectonic plate: It is a massive, irregularly-shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plates move horizontally over the asthenosphere as rigid units. .
  • Tillite: It is the sedimentary rock formed out of deposits of glaciers.
  • Sea Floor Spreading: The deep trenches have deep-seated earthquake occurrences while in the mid- oceanic ridge areas, the quake foci have shallow depths. These facts and a detailed analysis of magnetic properties of the rocks on either sides of the mid-oceanic ridge led Hess in 1961 to propose his hypothesis. It was called the “sea floor spreading”.

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 5 Minerals and Rocks

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Class 11 Geography Notes Chapter 5 Minerals and Rocks

About 98 per cent of the total crust of the earth is composed of eight elements like oxygen, silicon, aluminium, iron, calcium, sodium, potassium and magnesium, and the rest is constituted by titanium, hydrogen, phosphorous, manganese, sulphur, carbon, nickel and other elements.

Thus, a mineral is a naturally occurring organic and inorganic substance, having an orderly atomic structure and a definite chemical composition and physical properties. A mineral is composed of two or more elements. But, sometimes single element minerals like sulphur, copper, silver, gold, graphite etc. are found.

There are many different kinds of rocks which are grouped under three families on the basis of their mode of formation. They are:

  • Igneous Rocks — solidified from magma and lava;
  • Sedimentary Rocks—the result of deposition of fragments of rocks by exogenous processes;
  • Metamorphic Rocks — formed out of existing rocks undergoing recrystallisation.

The basic source of all minerals is the hot magma in the interior of the earth. When magma cools, crystals of minerals appear and a systematic series of minerals are formed in sequence to solidify so as to form rocks.

Granite, gabbro, pegmatite, basalt, volcanic breccia and tuff are some of the examples of . igneous rocks.

The word ‘sedimentary’ is derived from the Latin word sedimentum, which means settling.

There are at least 2,000 minerals that have been named and identified in the earth crust; but almost all the commonly occurring ones are related to six major mineral groups that are known as major rock forming minerals.

Class 11 Geography Notes Chapter 5 Important terms:

  • Petrology: It is science of rocks. A petrologist studies rocks in all their aspects viz., mineral composition, texture, structure, origin, occurrence, alteration and relationship with other rocks.
  • Igneous Rocks: Igneous rocks form out of magma and lava from the interior of the earth, they are known as primary rocks. The igneous rocks (Ignis – in Latin means ‘Fire’) are formed when magma cools and solidifies.
  • Sedimentary Rocks: The word ‘sedimentary’ is derived from the Latin word sedimentum, which means settling.
  • Metamorphic Rocks: The word metamorphic means ‘change of form’. These rocks form under the action of pressure, volume and temperature (PVT) changes. Metamorphism occurs when rocks are forced down to lower levels by tectonic processes or when molten magma rising through the crust comes in contact with the crustal rocks or the underlying rocks are subjected to great amounts of pressure by overlying rocks.
  • Lithification: Rocks (igneous, sedimentary and metamorphic) of the earth’s surface are exposed to denudational agents, and are broken up into various sizes of fragments. Such fragments are transported by different exogenous agencies and deposited. These deposits through compaction turn into rocks. This process is called lithification.
  • Metamorphism: It is a process by which already consolidated rocks undergo recrystallisation and reorganization of materials within original rocks.
  • Dynamic Metamorphism: Mechanical disruption and reorganization of the original minerals within rocks due to breaking and crushing without any appreciable chemical changes is called dynamic metamorphism.
  • Rock Cycle: Rock cycle is a continuous process through which old rocks are transformed into new ones.
  • Lineation: In the process of metamorphism in some rocks grains or minerals get arranged in layers or lines. Such an arrangement of minerals or grains in metamorphic rocks is called foliation or lineation.
  • Banding: Sometimes minerals or materials of different groups are arranged into alternating thin to thick layers appearing in light and dark shades. Such a structure in metamorphic rocks is called banding.
  • Banding Rocks: Rocks displaying banding are called banded rocks.

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 6 Geomorphic Processes

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Class 11 Geography Notes Chapter 6 Geomorphic Processes

The earth’s crust is dynamic. It is undergoing change continuously. Some powers have led to changes in form of the earth. These powers have been divided into two parts: internal and external.

Internal forces keep giving birth to new land forms. External forces keep changing the forms of exiting land forms. In other words, the earth’s surface is being continuously subjected to by external forces originating within the earth’s atmosphere and by internal forces from within the earth. The external forces are known as exogenic forces and the internal forces are known as endogenic forces.

The endogenic and exogenic forces causing physical stresses and chemical actions on earth materials and bringing about changes in the configuration of the surface of the earth are known as geomorphic processes. Diastrophism and volcanism are endogenic geomorphic processes. Weathering, mass wasting, erosion and deposition are exogenic geomorphic processes.

All processes that move, elevate or build up portions of the earth’s crust come under
diastrophism. They include:

  • orogenic processes
  • epeirogenic processes
  • earthquakes
  • plate tectonics.

Temperature and precipitation are the two important climatic elements that control various processes.

There are three major groups of weathering processes :

  • chemical
  • physical or mechanical
  • biological weathering processes

A group of weathering processes viz; solution, carbonation, hydration, oxidation and reduction act on the rocks to decompose, dissolve or reduce them to a fine clastic state through chemical reactions by oxygen, surface and/or soil water and other acids. Water and air (oxygen and carbon dioxide) along with heat must be present to speed up all chemical reactions. Over and above the carbon dioxide present in the air, decomposition of plants and animals increases the quantity of carbon dioxide underground.

Oxidation occurs where there is ready access to the atmosphere and oxygenated waters. The minerals most commonly involved in this process are iron, manganese, sulfur etc. In the process of oxidation rock breakdown occurs due to the disturbance caused by addition of oxygen. Red color of iron upon oxidation turns to brown or yellow.

Hydration is the chemical addition of water. Minerals take up water and expand; this expansion causes an increase in the volume of the material itself or rock. The process causes fatigue in the rocks and may lead to their disintegration,

Carbonation is the reaction of carbonate and bicarbonate with minerals and is a common process helping the breaking down of feldspars and carbonate minerals. Carbon dioxide from the atmosphere and soil air is absorbed by water, to form carbonic acid that acts as a weak acid. Calcium carbonates and magnesium carbonates are dissolved in carbonic acid and are removed in a solution without leaving any residue resulting in cave formation.
Class 11 Geography Notes Chapter 6 Geomorphic Processes 1
When oxidized minerals are placed in an environment where oxygen is absent, reduction takes place. Such conditions exist usually below the water table, in areas of stagnant water and waterlogged ground. Red colour of iron upon reduction turns to greenish or bluish grey.

Debris Avalanches and landslides transfer the mass of rock debris down the slopes under the direct influence of gravity. That means, air, water or ice do not carry debris with them from place to place but on the other hand the debris may carry with it air, water or ice.

In our country, debris avalanches and landslides occur very frequently in the Himalayas. There are many reasons for this. One, the Himalayas are tectonically active. They are mostly made up of sedimentary rocks and unconsolidated and semi-consolidated deposits. The slopes are very steep.

Class 11 Geography Notes Chapter 6 Important Terms:

  • Landslides: These are relatively rapid and perceptible movements. The materials involved are relatively dry. The size and shape of the detached mass depends on the nature of discontinuities in the rock, the degree of weathering and the steepness of the slope.
  • Gradation: The phenomenon of wearing down of relief variations of the surface of the earth through erosion is known as gradation.
  • Geomorphic processes: The endogenic and exogenic forces causing physical stresses and chemical actions on earth materials and bringing about changes in the configuration of the surface of the earth are known as geomorphic processes.
  • Exogenic forces: The external forces are known as exogenic forces. These forces derive their energy from atmosphere determined by the ultimate energy from the sun and also the gradients created by tectonic factors.
  • Endogenic forces: The internal forces are known as endogenic forces.
  • Geomorphic agents: An agent is a mobile medium (like running water, moving ice masses, wind, waves and currents  etc.) which removes, transports and deposits earth materials. Running water, groundwater, glaciers, wind, waves and currents, etc., can be called geomorphic agents.
  • Diastrophism: All processes that move, elevate or build up portions of the earth’s crust come under diastrophism.
  • Orogepy: It is a mountain building process
  • Epeirogeny: It is continental building process.
  • Volcanism: Volcanism includes the movement of molten rock called magma onto or toward the earth’s surface and also formation of many intrusive and extrusive volcanic forms.
  • Stress: Gravitational force acts upon all earth materials having a sloping surface and tend to produce movement of matter in down slope direction. Force applied per unit area is called stress.
  • Weathering: Weathering is defined as mechanical disintegration and chemical decomposition of rocks through the actions of various elements of weather and climate.
  • Denudation: The term ‘denude’ means to strip off or to uncover. Weathering, mass wasting/ movements, erosion and transportation are included in denudation.
  • Solution: When something is dissolved in water or acids, the water or acid with dissolved contents is called solution.
  • Carbonation: Carbonation is the reaction of carbonate and bicarbonate with minerals and is a common process helping the breaking down of feldspars and carbonate minerals.
  • Hydration: Hydration is the chemical addition of water.
  • Structure: The term structure includes such aspects of rocks as folds, faults, orientationand inclination of beds, presence or absence of joints, bedding planes, hardness or softness of constituent minerals, chemical susceptibility of mineral constituents; the permeability or impermeability etc. ,
  • Enrichment: When rocks undergo weathering, some materials are removed through chemical or physical leaching by groundwater and thereby the concentration of valuable materials increases. It makes the concentration of the same valuable material sufficient and economically viable to be exploited, processed and refined. This is called enrichment.
  • Debris Slide: Rapid rolling or sliding of earth debris without backward rotation of mass is known as debris slide.
  • Erosion: The erosion can be defined as “application of the kinetic energy associated with the agent to the surface of the land along which it moves”.
  • Soil: A pedologist who studies soils defines soil as a collection of natural bodies on the earth’s surface containing living and/or dead matter and supporting or capable of supporting plants. Soil is a dynamic medium in which many chemical, physical and biological activities go on constantly.
  • Deposition: The erosional agents loose their velocity and hence energy on gentler slopes and the materials carried by them start to settle themselves. Therefore, deposition is not actually the work of any agent. The coarser materials get deposited first and finer ones later. By deposition depressions get filled up.
  • Slump: Slump is slipping of one or several units of rock debris with a backward rotation with respect to the slope over which the movement takes place.
  • Pedology: It is soil science.
  • Pedologist: A pedologist is a soil-scientist.
  • Parent Material: Parent material is a passive control factor in soil formation.
  • Earth Flow: Movement of water-saturated clayey or silty earth materials down low-angle terraces or hillsides is known as earth flow.
  • Nitrogen Fixation: Humus accumulates in cold climates as bacterial growth is slow. With undecomposed organic matter because of low bacterial activity, layers of peat develop in sub-arctic and tundra climates. In humid tropical and equatorial climates, bacterial growth and action is intense and dead vegetation is rapidly oxidised leaving very low humus content in the soil. Further, bacteria and other soil organisms take gaseous nitrogen from the air and convert it into a chemical form that can be used by plants. This process is known as nitrogen fixation.
  • Desilication: Removal of silica from the soil is known as desilication.
  • Exfoliation: It is a result but not a process. Flaking off of more or less curved sheets of shells from over rocks or bedrock results in smooth and rounded surfaces is called exfoliation.
  • Exfoliation domes: Large, smooth rounded domes are called exfoliation domes.
  • Tors: In rocks like granites, smooth surfaced and rounded small to big boulders form due to such exfoliation. It is called tors.

Class 11 Geography Notes

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Important Questions for Class 12 History Chapter 1 Bricks, Beads and Bones (The Harappan Civilisation)

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Important Questions for Class 12 History Chapter 1 Bricks, Beads and Bones (The Harappan Civilisation)

Important Questions for Class 12 History Chapter 1 – 2 Marks Questions

Question 1.
Who was John Marshall? How did he mark a change in the Indian archaeology? (Delhi 2016)
Answer:
John Marshall was the Director-General of the Archaeological Survey of India. His contribution in the Indian Archeology can be understood by the following points:

  • He announced the discovery of new civilization i.e. Indus valley civilization.
  • He helped in the preservation or conservation of Sanchi Stupa.

Question 2.
Who was R.E.M Wheeler? Mention any one of his contributions in the field of archaeology? (Delhi 2016)
Answer:
R.E.M Wheeler was the Director-General of tire Archaeological Survey of India.
He was the first person who recognized that it was necessary’ to follow the stratigraphy of the mound rather than dig mechanically along uniform horizontal line which rectified the previous problems faced by the archaeologists.

Question 3.
Who was Cunningham? Mention any one account used by him to locate the early settlements of Harappan’ civilisation. (Delhi 2013)
Answer:
Cunningham was the first Director
General of the Archaeological Survey of India who began archaeological excavation in the mid-nineteenth century.
Cunningham used the accounts left by Chinese Buddhist pilgrims who visited the subcontinent between the 4th and 7th century CE to locate early settlements.

Question 4.
How were Harappa seals and sealings used to facilitate long distance communication? What did the sealings convey? (HOTS; All India 2013)
Answer:
Harappa seals and sealings were used to facilitate long distance communication. The mouth of the bag of goods was tied up with rope and on the knot was affixed some wet clay on which one or more seals were pressed, leaving an impression.
This sealing conveyed that if the bag reached with its sealing intact, then it had not been tampered with and also it conveyed the true identity of the sender of the goods.

Question 5.
Mention the two sections of the Harappan settlements and give one main feature of each.
or
Give two features of the Harappan settlements? (Delhi 2011)
The Harappan settlements were divided into two sections, i.e. the Citadel and the Lower Town. There features are:

  • The Citadel was smaller but higher than the Lower Town and was walled.
  • In the Lower Town, several buildings were built on platforms and all building activity within the city was restricted to a fixed area on the platforms.

Question 6.
Give any two features of Harappan writing. (Delhi 2008)
Answer:
Harappan seals usually have a line of writing, which remains undeciphered still today. Its features are:

  • It is not alphabetical and has too many signs, somewhere between 375 and 400.
  • The script is written from right to left.

Important Questions for Class 12 History Chapter 1 – 4 Marks Questions

Question 7.
Describe the distinctive features of domestic architecture of Mohenjodaro. (All India 2017)
Answer:
The most unique feature of the Harappan Civilisation was the development of urban centres. Mohenjodaro is the most well-known site of Harappan Civilisation. The settlement was divided into following sections:

Citadel It was smaller but higher. It was walled and was physically separated from the lower town. Here the buildings were constructed with mud, bricks platform. Here, we find some structures that were probably used for special public purposes.

The Lower Town The lower town was also walled. Several buildings were built on platforms, which served as foundations. All building activity within the city was restricted to a fixed area on the platforms.

Drainage System Mohenjodaro had carefully planned drainage system. The roads and the streets were laid out along an approximate ‘grid’ pattern, intersecting at right angles. It seems that streets with drains were laid out first and then houses built along them. Every house had its own bathroom paved with bricks, with drains connected through the walls, to the street drains.

Question 8.
Mention any two changes that were observed after 1900 BCE in Harappan Civilisation. What could have brought these changes? Explain. (Delhi 2016)
Answer:
After 1900 BCE, very’ few Harappan sites were continued and significant changes appeared in the civilisation. These were:

  • In this period, distinctive artefacts like weights, seals, special beads, writing, long-distance trade and craft specialisation disappeared.
  • (House construction technique deteriorated and large public structures were no longer produced. Late Harappan Civilisation indicates a rural way of life. Long distance trade also disappeared.
  • The reasons for these changes were:
    • These changes were probably the result of climate change, deforestation and excessive flood.
    • The shifting or drying up of rivers and overuse of the landscape might be the cause. There was also decline and abandonment of cities due to these reasons.

9. Why do archaeologists and historians find Harappan script enigmatic? Explain reasons. (HOTS; Delhi 2016)
Answer:
Archaeologists and historians found
Harappan script enigmatic. The reasons behind it were:

  • Harappan seals usually had a line of writing, containing the name and title of the owner, sometimes the motif conveyed a meaning to those who could not read.
  • The script was non-alphabetical, it had many signs, somewhere between 375 and 400. It was written from right to left.
  • Most inscriptions were short, the longest contained about 26 signs, each sign stood for a vowel or consonant. Sometimes it contained wider space, sometimes shorter, had no consistency. Till today, the script remains undeciphered.

Question 10.
‘Early Harappan archaeologists thought that certain objects which seem unusual and unfamiliar may have had a religious significance’. Substantiate. (All India 2016)
or
Describe briefly how seals of Harappan period help in reconstructing their religious beliefs. (Delhi 2010)
Answer:
Giving archaeologic interpretation to reconstruct religious practices of Harappan civilisation was not easy.
The important facts to reconstruct the religious belief of the Harappan period are as follows:

1. Archaeologists thought that certain objects which seemed unusual or unfamiliar may have had a religious significance. These included terracotta figurines of women, heavily jewelled with elaborate head dresses. These were regarded as mother Goddesses.

2. Rare stone statuary of men seated with one hand on the knee was regarded as ‘priest king’. Other structures found in Harappan Civilisation, like the great bath and fire altars found at Kalibangan and Lothal also were taken as significant for ritual practices.

3. Attempts were made to reconstruct religious beliefs and practices by examining different seals.

4. Mythical creatures like unicorn, figure seated cross-legged in yogic posture, sometimes surrounded by animals, regarded as ‘proto-shiva’ were all examples of Hindu religion. Conical stone objects were classified as Tingas’.
Many reconstructions of Harappan religion are made on the assumption that later traditions provide similarity with earlier ones. It follows from the rule that archaeologists try to know the facts by following the process of ‘known to the unknown.’ Thus, reconstructing religious practices was not easy for the archaeologists.

Question 11.
‘One of the most distinctive features of the Harappan cities was the carefully planned drainage system.’ Elaborate. (All India 2016)
Arts.

One of the most distinctive features of Harappan Civilisation was its carefully planned drainage system. If we look at the plan of the Lower Town, we can find that roads and streets were laid out along an approximate ‘grid’ pattern, intersecting at right angles. Every house had one wall alongside the street having drain connected to the street drain to flow out domestic waste water. It seems that streets with drains were laid out first and then houses built along them.

Mackay said about the drains, “It is certainly the most complete ancient system as yet discovered”. According to him, every house was connected to the street drains. The main channels were made of bricks set in Mortar and were covered with loose bricks that could be removed for cleaning. Sometimes limestone was used for the covers.
In Harappa, house drains first emptied into a sump or cesspit into which solid matter settled while waste water flowed out into the street drains. Very long drainage channels . were provided at intervals with sumps for cleaning.
Little heaps of material mostly sand were found lying alongside drainage channels, it meant that the debris was not always carted away when the drain was cleared.

Drainage systems were mostly found in smaller settlement, but were not unique to the larger cities. For example, at Lothal while houses were built of mud bricks, drains were made of burnt bricks. Therefore, we can say that Harappan cities have carefully planned drainage system.

Question 12.
How have historians provided new insight into the subsistence strategies of the Harappan culture? (Delhi 2015)
Answer:
According to historians mature Harappan culture developed in some of the areas occupied by the Early Harappan cultures. These cultures also shared certain common elements including subsistence strategies.
For example:

  • The Harappans ate a wide range of plant and animal products, including fish and meat, wheat, maize, millets, pulses, rice and another eatables.
  • Cattle, sheep, goat, buffalo and pig were domesticated by the Harappans for their sustenance.
  • The evidence of wild species like boar, deer and gharial have also been traced from the remains of bones, but it is not sure whether the Harappans hunted these animals themselves or obtained meat from other hunting community.
  • Archaeological evidences suggested that oxen were used for ploughing and two different crops were grown together. As most of the sites are located in semi-arid lands, it is evident that water from canals and wells was used for irrigation.

Question 13.
Explain the distinctive features of the residential buildings of Mohenjodaro. (Delhi 2015)
Answer:

The most unique feature of the Harappan Civilisation was the development of urban centres. Mohenjodaro is the most well-known site of Harappan Civilisation.

The following are the most unique architectural feature of Mohenjodaro: Citadel It was smaller but higher. It was walled and was physically separated from the lower town. Here the buildings w’ere constructed with mud, bricks platform. Here, we find some structures that were probably used for special public purposes.
These include the warehouse, a massive structure and the ‘Great Bath’. The uniqueness of the structure of ‘Great Bath’ suggested that it was meant for some kind of special ritual bath.

The Lower Town The lower town was also w’alled. Several buildings were built on platforms, which served as foundations. All building activity within the city was restricted to a fixed area on the platforms. Sun-dried or baked bricks were used at all Harappan settlements.

The courtyard of the houses was the centre of activities like cooking and weaving, particularly during hot and dry weather. There were no windows in the walls along the ground level. Besides, the main . entrance did not give a direct view of the interior or the courtyard.

Drainage System Mohenjodaro had carefully planned drainage system. The roads and the streets were laid out along an approximate ‘grid’ pattern, intersecting at right angles. It seems that streets with drains were laid out first and then houses built along them.

Every house had its own bathroom paved with bricks, with drains connected through the walls, to the street drains. Drainage systems were not only unique to the larger cities, but were found in smaller settlements also. All these features indicated that Mohenjodaro had a well planned architectural system.

Question 14.
Explain the strategies used by the archaeologists to understand socio-economic differences among the Harappans. (Delhi 2015)
Answer:
The archaeologists have tried to find out socio-economic differences among the Harappans through two types of evidences.

These were: Burials Burials have been significant evidence to establish social differences within the Harappan society’.
The dead were generally laid in pits. There were differences in the way the burial pit was made. In some cases, the hallowed out spaces were lined with bricks.

However, whether these variations were an indication of social differences or not, it is not yet established. Pottery ornaments, jewellery of both men and women have been found in some burials. But the Harappans did not believe in burying precious things with the dead.

Artefacts Two types of artefacts have been found, i.e. luxuries’ and ‘utilitarian’. Luxuries artefacts were made from costly and rare, non-local material with complicated technology e.g. little faience pots. Utilitarian objects included objects of daily use made of stone clay, e.g. querns, pottery, needles, flesh-rubbers (body scrubbers), etc. As far as distribution of such artefacts is concerned, we find that rare objects made of valuable materials were generally concentrated in large settlements like Mohenjodaro and Harappa and are rarely found in smaller settlements.
Thus, the findings of the above artefacts prove that there were social and economic differences in Harappan culture.

Question 15.
Explain the strategies for procuring
materials by the Harappans for the craft production. (All India 2013)
Answer:
In Harappan Civilisation, a variety of materials was used for craft production. These were:

  • Clay was locally available, but stone, timber and metal had to be procured from outside.
  • They established settlements, such as Nageshwar and Balakot in areas where shell was available. Other such sites were Shortughai, the best source of lapis lazuli, a blue stone found here; from Lothal Carnelian, steatite were found.
  • Raw materials were also collected from Khetri region of Rajasthan (for copper)
    and South India (for gold). Recent archaeological finds suggest that copper was probably brought from Oman. The fact was also supported by Mesopotamian texts. Probably Harappan Civilisation was connected with Oman, Bahrain or Mesopotamia by sea.

Question 16.
Describe the opinions of the archaeologists over the central authority of the Harappan Civilisation. (All India 2015)
or
“The archaeological records provide no immediate answer to the Harappa central authority’. Analyse different views given on the same.
Answer:
Opinion of some of the archaeologists about the Harappan society are as follows:

  • Some archaeologists opine that Harappan society had no rulers and that everybody enjoyed equal status.
  • Other scholars have the opinion that there was no single ruler but several. Mohenjodaro had a separate ruler, Harappans had another. In the same way, other regions had different rulers.
  • Some scholars also argued that there was a single state given the similarity in artefacts, the evidence for planned settlements, the standardised ratio of brick size and the establishments near source of raw material.
  • Of all, the last theory seems to be the most plausible as it is unlikely that entire communities could have collectively made and implemented such complex decisions.

Question 17.
Explain the exclusive features of the craft production in Chanhudaro. (All India 2015)
Answer:
Chanhudaro was a tiny settlement as compared to Mohenjodaro. This area was exclusively devoted to craft production. Its features are:
1. The main craft productions included bead-making, shell-cutting, metal-working, seal-making and weight-making.

2. Here variety of materials were used to make beads. Stones like carnelian jasper, crystal, quartz, steatite; metals like copper, bronze and gold, moreover shell, faience and terracotta or burnt clay were used.

3. Some beads were made of two or more stones, these were cemented together and some were made of stones with beautiful gold caps. The shapes were of different types, e.g. dice cylindrical, spherical, barrel- shaped, etc. Some beads were decorated by incising or painting and some had designs etched (engraved) on to them.

4. Different techniques were applied in making beads. Steatite was a very soft stone and could be easily moulded. But how the steatite micro bead was made remains a surprise for the archaeologists. The red colour of carnelian
was obtained by firing the raw material. Grinding, polishing and drilling completed the full process. Specialised drills have been found at Chanhudaro, Lothal and Dholavira.

Question 18.
Mention any three features of Harappan cities. (All India 2011)
Answer:
Historians suggest that the most unique feature of the Harappan Civilisation was the development of urban centres, i.e., cities. The main features of Harappan cities were:

  • The Harappan cities were well planned. The cities were divided into two sections which are one smaller and higher, i.e. the Citadel and other much larger but lower, i.e. the Lower Town. Both these sections were walled and physically separated from each other.
  • One of the most distinctive features of Harappan cities was the carefully planned drainage system. If we look at the plan of the Lower Town, the roads and streets were laid out along an approximate ‘grid’
    ‘ pattern, intersecting at right angles.
  • At burials in Harappan areas, the dead were generally laid in pits. Some graves contained pottery and ornament, which indicated the belief that these materials could be used in the afterlife. But the Harappan did not believe in burying precious things with the dead.

Question 19.
Describe briefly how the centres of craft production are identified. (Delhi 2009)
Answer:
In order to identify centres of craft
production, archaeologists usually look for the raw materials, like stone modules, whole shells, copper ore, unfinished objects, rejected and waste materials. Actually waste products indicate craft work. For example, if shell or stone is used to make any object, then pieces of shell or stone will be discarded as waste at the place of production.
These can be understood through following points:

  • Both Nageshwar and Balakot are near coast and shell objects are found here. These areas were specialised centre for making shell objects, including bangles, ladles and inlay, which were taken to other settlement.
  • Similarly, some finished products like different pots and beads are found in Lothal and Chanhudaro, which were taken to the large urban centres such as Mohenjodaro and Harappa.
  • For making beads, stones like carnelian, jasper, crystal, quartz, steatite and metals like copper, bronze, gold, and other materials like shell, faience, terracotta were used. For making beads, grinding, polishing and drilling were dome. Specialised drills have found at Chanhudaro, Lothal and Dholavira.
  • In order to identify the craft production centre, archaeologists look for raw materials and tools. Large- waste pieces of raw materials indicated the specialised craft production centres. But sometimes minuscule bits suggest that craft production was also undertaken in large cities like Harappa and Mohenjodaro.

Important Questions for Class 12 History Chapter 1 – 8 Marks Questions

Question 20.
How did architectural features of Mohenjodaro indicate planning? Support the statement with examples. Delhi 2014
Answer:
The most unique feature of the Harappan Civilisation was the development of urban centres. Mohenjodaro is the most well-known site of Harappan Civilisation.

The following are the most unique architectural feature of Mohenjodaro: Citadel It was smaller but higher. It was walled and was physically separated from the lower town. Here the buildings w’ere constructed with mud, bricks platform. Here, we find some structures that were probably used for special public purposes.
These include the warehouse, a massive structure and the ‘Great Bath’. The uniqueness of the structure of ‘Great Bath’ suggested that it was meant for some kind of special ritual bath.

The Lower Town The lower town was also w’alled. Several buildings were built on platforms, which served as foundations. All building activity within the city was restricted to a fixed area on the platforms. Sun-dried or baked bricks were used at all Harappan settlements.

The courtyard of the houses was the centre of activities like cooking and weaving, particularly during hot and dry weather. There were no windows in the walls along the ground level. Besides, the main . entrance did not give a direct view of the interior or the courtyard.

Drainage System Mohenjodaro had carefully planned drainage system. The roads and the streets were laid out along an approximate ‘grid’ pattern, intersecting at right angles. It seems that streets with drains were laid out first and then houses built along them.

Every house had its own bathroom paved with bricks, with drains connected through the walls, to the street drains. Drainage systems were not only unique to the larger cities, but were found in smaller settlements also. All these features indicated that Mohenjodaro had a well planned architectural system.

Question 21.
“The archaeological records provide no immediate answer to the Harappa’s central authority”. Analyse different views given in the same. (HOTS; Delhi 2013)
Answer:
If we want to analyse the concept of central authority of Harappan civilisation, the archaeological findings provide no immediate answer.
In support of these, some reasons have given by some archaeologists:

  • At the site of Mohenjodaro, a large building was found, but there were no such specific evidences which could have any association with it.
  • A stone statue was found at the site of Mohenjodaro labelled as the ‘priest king’. It was so because archaeologists had prior information of such statue found at the site of Sind and which was labelled as the priest king. But till date, the ritual practices of Harappans have not been understood. So, there are no reasons of knowing whether those who performed ritual practices also held some political power.
  • On the other hand, some archaeologists have also the view that there were no rulers in the Harappan society. According to them, all enjoyed equal status.
  • Other archaeologists feel that there was no single ruler, but there were several rulers.
  • Even some scholars argued that there was a single state which is evident from the similar artefacts, the planned settlements, the standardised bricks.

Question 22.
What are the aspects of Harappan economy that have been reconstructed from archaeological evidence? (All India 2013)
Answer:
The aspects of Harappan economy that have been reconstructed from the archaeological evidences are:
Agriculture From the evidences, it has been found that the agriculture was one of the most important source of food.

Evidences such as charred grains have been found in the Harappan Civilisation. The seeds like wheat, barley, lentil, chickpea and sesame were cultivated in the Harappa whereas millets were found in Gujarat. The evidence of rice cultivation was not there. Evidence of agriculture was easy to find out, but there is difficulty to find out agricultural practices. From the finds of terracotta sculpture, it has been assumed . that the oxen were used for ploughing the land. Moreover, terracotta models of plough also have been found at the sites in Ebolistan (Thar desert), Pakistan.

The field had two sets of furrows at right angles to each other. The irrigation was also known to the Harappans. Traces of canals, well also have been found at the Harappan site of Shortughai in Afghanistan. Besides these finds, several water reservoirs also have been traced which may have been used for the irrigation of agriculture.
Animal Domestication From the finds of bones of animals such as sheep, goat, cow, oxen, buffalo, etc, it has been assumed that the domestication of animals was also there.

Procurement of Crafts Prevalence of artefacts such as pottery sculptures, bead making, seal and sealings were also there. Besides these, weaving, building construction, jewellery-making were there. Trade The Harappans had long distance communication, it is evident from the finds of seals and sealings of Harappans in the distant sites of Mesopotamia.

From the finds of certain metals such as bronze, copper and gold in Harappa which was procured in different sites, these metals were traded with the other distant civilisations developed in Oman. Archaeologists think that there were communication between Oman, Bahrain or Mesopotamia with the Harappan Civilisation.

Question 23.
What are the evidences found by the archaeologists which show that the Harappans had contacts with distant lands? Does it show that the contact proved to have good trade relations with each other. (All India 2011)
or
To what extent had the Harappans established trade relations with the world? (Delhi 2013)
Answer:
The archaeologists found many evidences which show that the Harappans had contacts with distant lands. The important evidences are

1. Recent archaeological finds suggest that copper was probably brought from Oman, on the South-Eastern tip of the Arabian found Peninsula. Moreover chemical analysis proved traces of nickel both in Omani copper and Harappan artefacts. This suggests a common origin of both.

2. A large Harappan jar coated with a thick layer of black clay was found at Omani sites. It is possible that the Harappans exchanged the contents of these vessels for Omani copper.

3. Mesopotamian texts of third millennium BCE referred that copper came from a region called Magan. Historians thought that probably it was another name of Oman. Mesopotamian texts also mentioned contact with regions named Dilmun (probably the Island of Bahrain), Magan and Meluhha, possibly the Harappan region. Meluhha was a land of seafarers. Many products of Meluhha were mentioned. These were carnelian, lapis lazuli, copper, gold and varieties of wood.

4. Other archaeological finds suggest of long distance contacts which include Harappan seals, weights, dice and beads. All these evidences suggest that Harappan Civilisation was connected with Oman, Bahrain or Mesopotamia by sea.

5. Depictions of ships and boats on seals indicate the trade relations between different countries.

6.Cylinder seal found in Mesopotamia has humped bull motif which can be derived from the Indus region. The round ‘Persian Gulf seal found in Bahrain sometimes carries Harappan motifs. Local ‘Dilmun’ weights followed the Harappan standard.

All these evidences show that Harappan civilisation had good trade relations with other regions.

Question 24.
What factors in your opinion are responsible for the collapse of a mature Harapp’an Civilisation by 1800 BCE? (HOTS; All India 2009)
Answer:
There is strong evidence1 that by 1800 BCE, most of the mature Harappan sites in regions like Cholistan had been . abandoned. Simultaneously, there was a growth of settlements in Gujarat, Haryana and Western Uttar Pradesh. At that time, distinctive artefacts of civilisation like weights, seals, special beads, writing, long-distance trade and craft specialisation disappeared. House construction technique deteriorated and large public structures were not produced.
A variety of explanations were given by scholars to explain the decline of mature Harappan Civilisation.
These reasons are:

  • Climatic change
  • Deforestation
  • Excessive floods
  • Shifting and drying up of rivers
  • Overuse of the landscape

Some of these reasons may be holding true for certain settlements, but they do not account for the collapse of the entire civilisation.
No single reason was responsible for the decline of this civilisation. The civilisation might be destroyed by invaders which was proved by the bulk of bones found. It indicated a slaughter.
But the skeletons found did not belong to the same period according to George Dales. Thus, it was not concluded in favour of a dramatic collapse, rather it was believed that the end of Harappan culture was a gradual process.

Question 25.
Describe the contribution of John Marshall, Director General of the ASI to Indian archaeology, (All India 2009)
Answer:
The two discoveries in seals in Harappa and Mohenjodaro by Daya Ram Sahni and Rakhal Das Banerji led to the conjecture that these two sites were part of a single archaeological culture. Based on these finds, in 1924, John Marshall, Director General of the ASI announced the discovery’ of a-new civilisation in the Indus valley to the world. Similar seals were also found in the excavation of archaeological sites of Mesopotamia. In this way, not only new civilisation came to limelight but we also came to know that this civilisation was contemporary to Mesopotamia.
Sir John Marshall’s term as the Director General of ASI was actually a term of major change in Indian archaeology. He was the first professional archaeologist who worked in India.

He brought with himself his experience of Greece and Crete. Like Cunningham, he was also interested in spectacular findings. But he was equally interested in looking for patterns of daily life. John Marshall tended to excavate along regular horizontal units, measured unit formly throughout the mound, ignoring the stratigraphy of the site and this was the biggest drawback in his excavation process. It means all the artefacts, found from the same unit, were grouped together, even if they were found at different stratigraphic layers. As a result, valuable information found about the civilisation was lost forever.

Question 26.
Explain briefly the distinctive features of Harappan drainage system. (Delhi 2008)
or
Describe briefly the drainage system of Harappan cities. (Delhi 2012)
or
Mention two features of drainage system of the Harappan cities. (All India 2015)
or
“The drainage system in Harappan Civilisation indicates town planning”. Support the statement with suitable examples.
Answer:
One of the most distinctive features of Harappan Civilisation was its carefully planned drainage system. If we look at the plan of the Lower Town, we can find that roads and streets were laid out along an approximate ‘grid’ pattern, intersecting at right angles. Every house had one wall alongside the street having drain connected to the street drain to flow out domestic waste water. It seems that streets with drains were laid out first and then houses built along them.

Mackay said about the drains, “It is certainly the most complete ancient system as yet discovered”. According to him, every house was connected to the street drains. The main channels were made of bricks set in Mortar and were covered with loose bricks that could be removed for cleaning. Sometimes limestone was used for the covers.
In Harappa, house drains first emptied into a sump or cesspit into which solid matter settled while waste water flowed out into the street drains. Very long drainage channels . were provided at intervals with sumps for cleaning.
Little heaps of material mostly sand were found lying alongside drainage channels, it meant that the debris was not always carted away when the drain was cleared.

Drainage systems were mostly found in smaller settlement, but were not unique to the larger cities. For example, at Lothal while houses were built of mud bricks, drains were made of burnt bricks. Therefore, we can say that Harappan cities have carefully planned drainage system.

Important Questions for Class 12 History Chapter 1 Map Based Question

Question 27.
On the given political outline map of India, locate and label the followings with appropriate symbols.

  • Rakhigarhi. (Delhi 2016)
  • Name of three mature Harappan sites. (All India 2016, Delhi 2015)
    or
    Five Harappan sites. Delhi 2008
  • Dholavira. (All India 2015), (Delhi 2014, 2008)
  • Lothal. (All India 2014, 2010), (Delhi 2012, 2008)
  • Kalibangan, Nageshwar.
    (All India 2013, 2012, Delhi 2012)
  • (a) Dholavira
    (b) Lumbini. (Delhi 2014)

Answer:
Important Questions for Class 12 History Chapter 1 Bricks, Beads and Bones (The Harappan Civilisation) Map 1

Important Questions for Class 12 History Chapter 1 Value Based Questions

Question 28.
Read the following passage and answer the question that follows.
In the few Harappan sites that continued to be occupied after 1900 BCE, there appears to have been a transformation of material culture, marked by the disappearance of the distinctive artefacts of the civilisation weights, seals, special beads. Writing, long distance trade, and craft specialisation also disappear. In general, far fewer materials were used to make far fewer things. House construction techniques were no longer produced. Overall, artefacts and settlements indicate a rural way of life in what are called “Late Harappan” or “Successor Cultures”.
How can we say that, transformation of material culture had been taking place in . few Harappan sites of this civilisation?
Answer:
There are various evidences available which prove that transformation of material culture had been taking place in few sites of Harappan Civilisation.
These evidences are:

  • This transformation of material culture, marked by the disappearance of the distractive artefacts of the civilisation such as weights, seals, special beads, etc.
  • Writing, long distance trade and craft specialisation also disappeared.
  • In general, far fewer materials were used to make far fewer things.
  • House construction techniques deteriorated and large public structures were no longer produced.
  • There was a shift from a standardised weight system to the use of local weights.
  • Overall, artefacts and settlements indicate a rural way of life in what are called “Late Harappan” or “Successor Cultures”.

Question 29.
Read the following passage and answer the questions that follow.
The frontiers of the Harappan Civilisation have little or no connection with present-day national boundaries.
However, with the partition of the sub-continent and the creation of Pakistan, the major sites are now in Pakistan territory. This has spurred Indian archaeologists to try and locate sites in India. An extensive survey in Kutch has revealed a number of Harappan settlements and explorations in Punjab and Harappan settlements have added to the list of Harappan sites. While Kalibangan, Lothal, Rakhi Garhi and most recently Dholavira have been discovered, explored and excavated as part of these efforts, fresh explorations continue.

  1. What problem has occurred in the frontiers of the Harappan Civilisation?
  2. What has spurred Indian archaeologists to do? Which settements have been found recently?

Answer:
1.  The problem which has occurred in the Harappan Civilisation is that the frontiers of this civilisation have little or no connection with present day national boundaries due to partition of Indian sub-continent and Pakistan. However, with the partition of the sub-continent and the creation of Pakistan, the major sites of Harappan Civilisation are now in Pakistan territory.

2. The partition between the two nations i.e. India and Pakistan, created a problem of demarcation of Harappan sites. This has spurred Indian archaeologists to try and locate these sites in India.
After extensive survey of Kutch, Punjab and Haryana, a number of new sites have been discovered, e.g. Kalibangan, Lothal, Rakhi Garhi and most recently Dholavira

Important Questions for Class 12 History

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Class 11 Geography Notes Chapter 7 Land forms and their Evolution

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Class 11 Geography Notes Chapter 7 Land forms and their Evolution

After weathering processes have had their actions on the earth materials making up the surface of the earth, the geomorphic agents like running water, ground water, wind, glaciers, waves perform erosion.

Due to changes in climatic conditions and vertical or horizontal movements of landmasses, either the intensity of processes or the processes themselves might change leading to new modifications in the land forms.

A landmass passes through stages of development somewhat comparable to the stages of life — youth, mature and old age. .

Changes on the surface of the earth owe mostly to erosion by various geomorphic agents. Of course, the process of deposition too, by covering the land surfaces and filling the basins, valleys or depressions brings changes in the surface of the land.

The geomorphic agents acting over long periods of time produce systematic changes leading to sequential development of land forms. Each geomorphic agent produces its own assemblage of land forms.

Many varieties of land forms develop by the action of each of the geomorphic agents depending upon especially the type and structure i.e. folds, faults, joints, fractures, hardness and softness, permeability and impermeability, etc.

In humid regions, which receive heavy rainfall running water is considered the most important of the geomorphic agents in bringing about the degradation of the land surface.

The gentler the river channels in gradient or slope, the greater is the deposition.

Streams are few during youth stage with poor integration and flow over original slopes showing shallow V-shaped valleys with no floodplains or with very narrow floodplains along trunk streams. Streams divides are broad and flat with marshes, swamp and lakes.

During mature stage, streams are plenty with good integration. The flat and broad inter stream areas and swamps and marshes of youth disappear and the stream divides turn sharp. Waterfalls and rapids disappear.

Smaller tributaries during old age meander freely over vast floodplains showing natural levees, oxbow lakes, etc.

Any limestone or dolomitic region showing typical land forms produced by the action of groundwater through the processes of solution and deposition is called Karst topography after the typical topography developed in limestone rocks of Karst region in the Balkans adjacent to Adriatic sea.

Drumlins are smooth oval shaped ridge-like features composed mainly of glacial till with some masses of gravel and sand. The long axes of drumlins are parallel to the direction of ice movement. They may measure up to 1 km in length and 30 m or so in height.

A glacier in its valley is slow unlike water flow. The movement could be a few centimeters to a few meters a day or even less or more. Glaciers move basically because of the force of gravity.

We have many glaciers in our country moving down the slopes and valleys in Himalayas. Higher reaches of Uttaranchal, Himachal Pradesh and Jammu and Kashmir, are places to see some of them.

The highest peak in the Alps, Matterhorn and the highest peak in the Himalayas, Everest are in fact horns formed through headward erosion of radiating cirques.

Erosional forms dominate in the west coast. The east coast of India is a low sedimentary coast. Depositional forms dominate in the east coast.

Class 11 Geography Notes Chapter 7 Important Terms:

  • Landforms: In simple words, small to medium tracts or parcels of the earth’s surface are called land forms.
  • Landscape: Several related landforms together make up landscapes.
  • Geomorphology: Geomorphology deals with the reconstruction of the history of the surface of the earth through a study of its forms, the materials of which is made up of and the processes that shape it.
  • Outwash Deposits: Some amount of rock debris small enough to be carried by such melt¬water streams is washed down and deposited. Such glacio- fluvial deposits are called outwash deposits.
  • Gorge: A gorge is a deep valley with very steep to straight sides.
  • Canyon: A canyon is characterised by steep step-like side slopes and may be as deep as a gorge.
  • Delta Plains: The flood plains in a delta are called delta plains.
  • Potholes: Over the rocky beds of hill-streams more or less circular depressions are formed because of stream erosion aided by the abrasion of rock fragments. They are called potholes.
  • Plunge Tools: A series of such depressions eventually join and the stream valley gets deepened. At the foot of waterfalls also, large potholes, quite deep and wide, form because of the sheer impact of water and rotation of boulders. Such large and deep holes at the base of waterfalls are called plunge pools.
  • Plunge Pools: At the foot of waterfalls also, large potholes, quite deep and wide, form because of the sheer impact of water and rotation of boulders. Such large and deep holes at the base of waterfalls are called plunge pools.
  • Incised Or Entrenched Meanders : Very deep and wide meanders can also be found cut in hard rocks. Such meanders are called incised or entrenched meanders
  • Karst Topography: Any limestone or dolomitic region showing typical land forms produced by the action of groundwater through the processes of solution and deposition is called Karst topography.
  • Paired Terraces: The river terraces may occur at the same elevation on either side of the rivers, these are called paired terraces.
  • Unpaired Terraces: When a terrace is present only on one side of the stream and with none on the other side or one at quite a different elevation on the other side, the terraces are called unpaired terraces.
  • Glacial Till: The unassorted coarse and fine debris dropped by the melting glaciers is called glacial till.
  • Ground Moraines: Many valley glaciers retreating rapidly leave an irregular sheet of till over their valley floors. Such deposits varying greatly in thickness and in surface topography are called ground moraines.
  • Medial Moraine: The moraine in the centre of the glacial valley flanked by lateral moraines is called medial moraine.
  • Barrier bars: Bars are submerged features and when bars show up above water, they are called barrier bars.
  • Spit: Barrier bar which get keyed up to the headland of a bay is called a spit.
  • Sea Stacks: Retreat of the cliff may leave some remnants of rock standing isolated as small islands just off the shore. Such resistant masses of rock, originally parts of a cliff or hill are called sea stacks.
  • Wave-Cut Terrace: At the foot of such cliffs there may be a flat or gently sloping platform covered by rock debris derived from the sea cliff behind. Such platforms occurring at elevations above the average height of waves is called a wave-cut terrace.
  • Off-Shore Bar: A ridge of sand and shingle formed in the sea in the off-shore zone (from the position of low tide waterline to seaward) lying approximately parallel to the coast is called an off-shore bar.
  • Parallel Retreat of Slopes Through Backwasting : Once, pediments are formed with a steep wash slope followed by cliff or free face above it, the steep wash slope and free faceretreat backwards. This method of erosion is termed as parallel retreat of slopes through backwasting.
  • Pediments: Gently inclined rocky floors close to the mountains at their foot with or without a thin cover of debris, are called pediments.
  • Pediplains: Through parallel retreat of slopes, the pediments extend backwards at the expense of mountain front, and gradually, the mountain gets reduced leaving an inselberg which is a remnant of the mountain. These low featureless plains are called pediplains.
  • Playas plains: These are by far the most prominent land forms in the deserts. In basins with mountains and hills around and along, the drainage is towards the centre of the basin and due to gradual deposition of sediment from basin margins, a nearly level plain forms at the centre of the basin. In times of sufficient water, this plain is covered up by a shallow water body. Such types of shallow lakes are called as playas where water is retained only for short duration due to evaporation and quite often the playas contain good deposition of salts.
  • Alkali Flats: The playa plain covered up by salts is called alkali flats.
  • Deflation hollows: Deflation hollows and caves weathered mantle from over the rocks or bare soil, gets blown out by persistent movement of wind currents in one direction. This process may create shallow depressions called deflation hollows.
  • Caves: Deflation also creates numerous small pits or cavities over rock surfaces. The rock faces suffer impact and abrasion of wind-borne sand and first shallow depressions called blow outs are created, and some of the blow outs become deeper and wider fit to be called caves.
  • Tunnels: Caves having openings at both the ends are called tunnels.
  • Glaciers: Masses of ice moving as sheets over the land or as linear flows down the slopes of mountains in broad trough-like valleys (mountain and valley glaciers) are called glaciers.
  • Fiords: Very deep glacial troughs filled with sea water and making up shorelines (in high latitudes) are called fiords.
  • Tam Lakes: A lake of water can be seen quite often within the cirques after the glacier disappears. Such lakes are called cirque or tarn lakes.

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 8 Composition and Structure of Atmosphere

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Class 11 Geography Notes Chapter 8 Composition and Structure of Atmosphere

The air is an integral part of the earth’s mass and 99 per cent of the total mass of the atmosphere is confined to the height of 32 km from the earth’s surface.

The air is colorless and odorless and can be felt only when it blows as wind.

The atmosphere is composed of gases, water vapour and dust particles. The proportion of gases changes in the higher layers of the atmosphere in such a way that oxygen will be almost in negligible quantity at the height of 120 km. Similarly, carbon dioxide and water vapour are found only up to 90 km from the surface of the earth.

Carbon dioxide is meteor logically a very important gas as it is transparent to the incoming solar radiation but opaque to the outgoing terrestrial radiation. It absorbs a part of terrestrial radiation and reflects back some part of it towards the earth’s surface. It is largely responsible for the green house effect.

Due to burning of fossil fuels, the volume of other gases is constant but the volume of carbon dioxide has been rising in the past few decades. It has also increased the temperature of the air.

Ozone is another important component of the atmosphere. It is found between 10 and 50 km above the earth’s surface and acts as a filter. It absorbs the ultra-violet rays radiating from the sun. It prevents them from reaching the surface of the earth.

Water vapour is such a variable gas in the atmosphere, which decreases with altitude. In the warm and wet tropics, it may account for four per cent of the air by volume, while in the dry and cold areas of desert and polar regions, it may be less than one per cent of the air.

Water vapour also decreases from the equator towards the poles. It absorbs parts of the isolation from the sun and preserves the earth’s radiated heat. It thus, acts like a blanket allowing the earth neither to become too cold nor too hot. Water vapour also contributes to the stability and instability in the air.

Atmosphere has a sufficient capacity to keep small solid particles, which may originate from different sources and include sea salts, fine soil, smoke-soot, ash, pollen, dust and disintegrated particles of meteors.

Dust particles are generally concentrated in the lower layers of the atmosphere yet convectional air currents may transport them to great heights.

The higher concentration of dust particles is found in subtropical and temperate regions due to dry winds in comparison to equatorial and polar regions.

Dust and salt particles act as hygroscopic nuclei around which water vapour condenses to produce clouds.

The atmosphere consists of different layers with varying density and temperature. Density is highest near the surface of the earth and decreases with increasing altitude.

The column of atmosphere is divided into five different layers depending upon the temperature condition. They are: troposphere, stratosphere, mesosphere, thermosphere and exosphere.

The troposphere is the lowermost layer of the atmosphere. Its average height is 13 km and extends roughly to a height of 8 km near the poles and about 18 km at the equator. Thickness of the troposphere is greatest at the equator because heat is transported to great heights by strong convectional currents. This layer contains dust particles and water vapour. All changes in climate and weather take place in this layer. The temperature in this layer decreases at the rate of 1°C for every 165m of height.

The zone separating the troposphere from stratosphere is known as the tropopause. The air temperature at the tropopause is about minus 80°C over the equator and about minus 45°C over the poles.

The stratosphere is found above the tropopause and extends up to a height of 50 km. One important feature of the stratosphere is that it contains the ozone layer. This layer absorbs ultra-violet radiation and shields life on the earth from intense, harmful form of energy.

The mesosphere lies above the stratosphere, which extends up to a height of 80 km. In this layer, temperature starts decreasing with the increase in altitude and reaches up to minus 100°C at the height of 80 km.

The upper limit of mesosphere is known as the mesopause. The ionosphere is located between 80 and 400 km above the mesopause. It contains electrically charged particles known as ions, and hence, it is known as ionosphere. Radio waves transmitted from the earth are reflected back to the earth by this layer. Temperature here starts increasing with height.

The uppermost layer of the atmosphere above the thermosphere is known as the exosphere. This is the highest layer but very little is known about it.

Class 11 Geography Notes Chapter 8 Important Terms:

  • Ions: Electrically charged particles are called ions.
  • Atmosphere: Atmosphere is a mixture of different gases and it envelopes the earth all round. It contains life-giving gases like oxygen for humans and animals and carbon dioxide for plants.
  • Tropopause: The zone separating the troposphere from stratosphere is known as the tropopause.
  • Mesopause: The upper limit of mesosphere is known as the mesopause.
  • Troposphere: The troposphere is the lowermost layer of the atmosphere. Its average height is 13 km and extends roughly to a height of 8 km near the poles and about 18 km at the equator. Thickness of the troposphere is greatest at the equator because heat is transported to great heights by strong convectional currents.
  • Stratosphere: The stratosphere is found above the tropopause and extends up to a height of 50 km. This layer absorbs ultra-violet radiation and shields life on the earth from intense, harmful form of energy.
  • Mesosphere: The mesosphere lies above the stratosphere, which extends up to a height of 80 km. In this layer, temperature starts decreasing with the increase in altitude and reaches up to minus 100°C at the height of 80 km.
  • Ionosphere: The ionosphere is located between 80 and 400 km above the mesopause. It contains electrically charged particles known as ions, and hence, it is known as ionosphere.
  • Exosphere: The uppermost layer of the atmosphere above the thermosphere is known as the exosphere. This is the highest layer but very little is known about it.

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 9 Solar Radiation, Heat Balance and Temperature

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Class 11 Geography Notes Chapter 9 Solar Radiation, Heat Balance and Temperature

We live at the bottom of a huge pile of air. We inhale and exhale but we feel the air when it is in motion. It means air in motion is wind.

Envelop of air is atmosphere which is formed of multitude gases. These gases support life over the earth’s surface.

The earth’s surface receives most of its energy in short wavelengths.

The annual insolation received by the earth on 3rd January is slightly more than the amount received on 4th July. However, the effect of this variation in the solar output is masked by other factors like the distribution of land, sea and the atmospheric circulation. Hence, this variation in the solar output does not have great effect on daily weather changes on the surface of the earth.

The earth receives its entire energy from the sun and reflect most of it back to the space. Therefore, we see that the earth neither remains cold nor hot for too long. And hence temperature at different places of the earth is different. This difference in temperature causes difference in pressure.

As the earth is a geoid resembling a sphere, the sun’s rays fall obliquely at the top of the atmosphere and the earth intercepts a very small portion of the sun’s energy. On an average the earth receives 1.94 calories per sq. cm per minute at the top of its atmosphere.

The solar output received at the top of the atmosphere varies slightly in a year due to the variations in the distance between the earth and the sun.

During its revolution around the sun, the earth is farthest from the sun (152 million km) on 4th July, ‘t his position of the earth is called aphelion.

On 3rd January, the earth is the nearest to the sun (147 million km). This position is called perihelion.

The annual insolation received by the earth on 3rd January is slightly more than the amount received on 4th July.

The amount of solar radiation keeps changing daily, on the basis of weather and per year.

Output is masked by other factors like the distribution of land and sea and the atmospheric circulation. Hence, this variation in the solar output does not have great effect on daily weather changes on the surface of the earth.

The earth’s axis makes an angle of 6614 with the plane of its orbit round the sun has a greater influence on the amount of insolation received at different latitudes.

The insolation received at the surface varies from about 320 Watt/m2 in the tropics to about 70 Watt/m2 in the poles.

Maximum insolation is received over the subtropical deserts, where the cloudiness is the least. Equator receives comparatively less insolation than the tropics. Generally, at the same latitude the insolation is more over the continent than over the oceans. In winter, the middle and higher latitudes receive less radiation than in summer.

The earth after being heated by insolation transmits the heat to the atmospheric layers near to the earth in long wave form. The air in contact with the land gets heated slowly and the upper layers in contact with the lower layers also get heated. This process is called conduction.

The air in cpntact with the earth rises vertically on heating in the form of currents and further transmits the heat of the atmosphere. This process of vertical heating of the atmosphere is known as convection.

Out of 100 units of heat received, roughly 35 units are reflected back to space even before reaching the earth’s surface. Of these, 27 units are reflected back from the top of the clouds and 2 units from the snow and ice-covered areas of the earth. The remaining 65 units are absorbed, 14 units within the atmosphere and 51 units by the earth’s surface.

Normally, temperature decreases with increase in elevation. It is called normal lapse rate. At times, the situations is reversed and the normal lapse rate is inverted. It is called Inversion of temperature. Inversion is usually of short duration but quite common nonetheless.

A long winter night with clear skies and still air is ideal situation for inversion. The heat of the day is radiated off during the night, and by early morning hours, the earth is cooler than the air above. Over polar areas, temperature inversion is normal throughout the year.

Surface inversion promotes stability in the lower layers of the atmosphere. Smoke and dust particles get collected beneath the inversion layer and spread horizontally to fill the lower strat a of the atmosphere. Dense fogs in mornings are common occurrences especially during winter season. This inversion commonly lasts for few hours until the sun comes up and beings to warm the earth. The inversion takes place in hills and mountains due to air drainage.

Blowing of cold air at the hills and mountains, during night, flows under the influence of gravity. Being heavy and dense, the cold air acts almost like water and moves down the slope to pile up deeply in pockets and valley bottoms with warm air above.

Class 11 Geography Notes Chapter 9 Important Terms:

  • Insolation: The energy received by the earth is known as incoming solar radiation which in short is termed as insolation.
  • Aphelion: During its revolution around the sun, the earth is farthest from the sun (152 million km) on 4th July. This position of the earth is called aphelion.
  • Perihelion: On 3rd January, the earth is the nearest to the sun (147 million km). This position is called perihelion.
  • Terrestrial radiation: The insolation received by the earth is in short waves forms and heats up its surface. The earth after being heated itself becomes a radiating body and it radiates energy to the atmosphere in long wave form. This energy heats up the atmosphere from below. This process is known as terrestrial radiation.
  • Conduction: The earth after being heated by insolation transmits the heat to the atmospheric layers near to the earth in long wave form. The air in contact with the land gets heated slowly and the upper layers in contact with the lower layers also get heated. This process is called conduction.
  • Convection: The air in contact with the earth rises vertically on heating in the form of currents and further transmits the heat of the atmosphere. This process of vertical heating of the atmosphere is known as convection.
  • Advection: The convective transfer of energy is confined only to the troposphere. The transfer of heat through horizontal movement of air is called advection.
  • Albedo: While passing through the atmosphere some amount of energy is reflected, scattered and absorbed. Only the remaining part reaches the earth surface. The reflected amount of radiation is called the albedo of the earth.
  • Normal lapse rate: Normally, temperature decreases with increase in elevation. It is called normal lapse rate.
  • Loo: Summer season local winds is called ‘loo’. It is the result of advection.
  • Isotherms: The Isotherms are lines joining places having equal temperature.
  • Inversion of temperature: At times, the situations is reversed and the normal lapse rate is inverted. It is called Inversion of temperature.
  • Air drainage: Being heavy and dense, the cold air acts almost like water and moves down the slope to pile up deeply in pockets and valley bottoms with warm air above. This is called air drainage. It protects plants from frost damages.
  • Plank’s law: Plank’s law states that hotter a body, the more energy it will radiate and shorter the wavelength of that radiation.
  • Specific heat: Specific heat is the energy needed to raise the temperature of one gram of substance by one Celsius.

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 10 Atmospheric Circulation and Weather Systems

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Class 11 Geography Notes Chapter 10 Atmospheric Circulation and Weather Systems

Air expands when heated and gets compressed when cooled. This results in variations in the atmospheric pressure. The result is that it causes the movement of air from high pressure to low pressure, setting the air in motion.

Air in horizontal motion is wind. Atmospheric pressure also determines when the air will
rise or sink.

The wind redistributes the heat and moisture across the planet, thereby, maintaining a constant temperature for the planet as a whole. The vertical rising of moist air cools it down to form the clouds and bring precipitation.

As one moves up the air gets varified and one feels breathless.

The atmospheric pressure is expressed in units of millibar or Pascal. Widely used unit is called kilopascal which is expressed as hpa.

At sea level the average atmospheric pressure is 1,013.2 millibar. Due to gravity the air at the surface is denser and hence has higher pressure.

Air pressure is measured with the help of a mercury barometer or the aneroid barometer.

The pressure decreases with height. At any elevation it varies from place to place and its variation is the primary cause of air motion, i.e. wind which moves from high pressure areas to low pressure .areas.

In the lower atmosphere the pressure decreases rapidly with height. The decrease amounts to about 1 mb for each 10 m increase in elevation. It does not always decrease at the same rate.

Air is set in motion due to the differences in atmospheric pressure. The air in motion is called wind. The wind blows from high pressure to low pressure.

Frictional force is greatest at the surface and its influence generally extends upto an elevation of 1 – 3 km. Over the sea surface the friction is minimal.

The rotation of the earth about its axis affects the direction of the wind. This force is called the Coriolis force after the French physicist who described it in 1844.

It deflects the wind to the right direction in the northern hemisphere and to the left in the southern hemisphere. The deflection is more when the wind velocity is high.

The Coriolis force is directly proportional to the angle of latitude. It is maximum at the poles and is absent at the equator. The Coriolis force acts perpendicular to the pressure gradient force. The pressure gradient force is perpendicular to an isobar. The higher the pressure gradient force, the more is the velocity of the wind and the larger is the deflection in the direction of wind.

The velocity and direction of the wind are the net result of the wind generating forces. The winds in the upper atmosphere, 2 – 3 km above the surface, are free from frictional effect of the surface and are controlled mainly by the pressure gradient and the Coriolis force.

During the day, the land heats up faster and becomes warmer than the sea. Therefore, over the land the air rises giving rise to a low pressure area, whereas the sea is relatively cool and the pressure over sea is relatively high. Thus, pressure gradient from sea to land is created and the wind blows from the sea to the land as the sea breeze. In the night the reversal of condition takes place. The land loses heat faster and is cooler than the sea. The pressure gradient is from the land to the sea and hence land breeze results.

In mountainous regions, during the day the slopes get heated up and air moves upslope and to fill the resulting gap the air from the valley blows up the valley. During the night the slopes get cooled and the dense air descends into the valley as the mountain wind. The cool air, of the high plateaus and ice fields draining into the valley.

Class 11 Geography Notes Chapter 10 Important Terms:

  • Atmospheric pressure: The weight of a column of air contained in a unit area from the mean sea level to the top of the atmosphere is called the atmospheric pressure. The atmospheric pressure is expressed in units of millibar.
  • Wind: The air in motion is called wind.
  • Pressure gradient force: The differences in atmospheric pressure produces a force. The rate of change of pressure with respect to distance is the pressure gradient.
  • Frictional force: It affects the speed of the wind. It is greatest at the surface and its influence generally extends upto an elevation of 1 – 3 km. Over the sea surface the friction is minimal.
  • Coriolis force: The rotation of the earth about its axis affects the direction of the wind. This force is called the Coriolis force after the French physicist who described it in 1844.
  • Geostrophic wind: When isobars are straight and when there is no friction, the pressure gradient force is balanced by the Coriolis force and the resultant wind blows parallel to the isobar. This wind is known as the geostrophic wind.
  • General circulation of the atmosphere: The pattern of the movement of the planetary winds is called the general circulation of the atmosphere.
  • Cell: The easterlies from either side of the equator converge in the Inter Tropical Convergence Zone (ITCZ). Such circulations from the surface upwards and vice-versa are called cells.
  • Hadley cells: A cell in the tropics is called Hadley cell.
  • Ferrel cells: In the middle latitudes the circulation is that of sinking cold air that comes from the poles and the rising warm air that blows from the subtropical high. At the surface these winds are called westerlies and the cell is known as the Ferrel cell.
  • Polar cell: At polar latitudes the cold dense air subsides near the poles and blows towards middle latitudes as the polar easterlies. This cell is called the polar cell.
  • Valley breeze: In mountainous regions, during the day the slopes get heated up and air moves upslope and to fill the resulting gap the air from the valley blows up the valley. This wind is known as the valley breeze.
  • Polar high: Near the poles the pressure is high and it is known as the polar high.
  • El Nino: The warm water of the central Pacific Ocean slowly drifts towards South American coast and replaces the cool Peruvian current. Such appearance of warm water off the coast of Peru is known as the El Nino.
  • Southern oscillation: The change in pressure condition over Pacific is known as the southern oscillation.
  • ENSO: The combined phenomenon of southern oscillation and El Nino is known as ENSO.
  • Katabatic wind: During the night, the slopes get cooled and the dense air descends into the valley as the mountain wind. The cool air, of the high plateaus and ice fields draining into the valley is called katabatic wind.
  • Air mass: The air with distinctive characteristics in terms of temperature and humidity is called an air mass. It is
  • defined as a large body of air having little horizontal variation in temperature and moisture.
  • Source regions: The homogeneous surfaces which are formed over air masses are called the source regions.
  • Fronts: When two different air masses meet, the boundary zone between them is called a front.
  • Cold front: When the cold air moves towards the warm air mass, its contact zone is called the cold front.
  • Warm front: If the warm air mass moves towards the cold air mass, the contact zone is called warm front.
  • Occluded front: If an air mass is fully lifted above the land surface, it is called the occluded front.
  • Extra tropical cyclone: The systems developing in the mid and high latitude, beyond the tropics are called the middle latitude or extra tropical cyclones.
  • Landfall of the cyclone: The place where a tropical cyclone crosses the coast is called the landfall of the cyclone.
  • A mature tropical cyclone: It is characterized by the strong spirally circulating wind around the centre, called the eye. The diameter of the circulating system can vary between 150 and 250 km. The eye is a region of calm with subsiding air.
  • Tropical cyclones: Tropical cyclones are violent storms that originate over oceans in tropical areas and shift to the coastal areas bringing about large scale destruction caused by violent winds, very heavy rainfall and storm surges. This is one of the most devastating natural calamities.
  • Tornado: From severe thunderstorms sometimes spiralling wind descends like a trunk of an elephant with great force, with very low pressure at the centre, causing massive destruction on its way. Such a phenomenon is called a tornado.
  • Water spouts: The tornado over the sea is called water spouts.

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 11 Water in the Atmosphere

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Class 11 Geography Notes Chapter 11 Water in the Atmosphere

The air contains water vapour. It varies from zero to four per cent by volume of the atmosphere and plays an important role in the weather phenomena.

Water is present in the atmosphere in three forms namely—gaseous, liquid and solid.

The moisture in the atmosphere is derived from water bodies through evaporation and from plants through transpiration. Thus, there is a continuous exchange of water between the atmosphere, the oceans and the continents through the processes of evaporation, transpiration, condensation and precipitation.

The air containing moisture to its full capacity at a given temperature is said to be saturated. It means that the air at the given temperature is incapable of holding any additional amount of moisture at that stage. The temperature at which saturation occurs in a given sample of air is known as dew point.

The ability of the air to hold water vapour depends entirely on its temperature. The absolute humidity differs from place to place on the surface of the earth. The percentage of moisture present in the atmosphere as compared to its full capacity at a given temperature is known as the relative humidity.

With the change of air temperature, the capacity to retain moisture increases or decreases and the relative humidity is also affected. It is greater over the oceans and least over the continents.

Movement of air replaces the saturated layer with the unsaturated layer. Hence, the greater the movement of air, the greater is the evaporation.

The transformation of water vapour into water is called condensation. Condensation is caused by the loss of heat. When moist air is cooled, it may reach a level when its capacity to hold water vapour ceases.

Condensation also takes place when the moist air comes in contact with some colder object and it may also take place when the temperature is close to the dew point.

After condensation the moisture of atmosphere or humidity gets converted into dew, fog, mist, frost and clouds.

The ideal conditions for formation of dew are clear sky, calm air, high relative humidity, and cold and long nights.

Frost forms on cold surfaces when condensation takes place below freezing point (0°C), i.e. the dew point is at or below the freezing point.

The only difference between the mist and fog is that mist contains more moisture than the fog. In mist each nuclei contains a thicker layer of moisture.

Fogs are drier than mist and they are prevalent where warm currents of air come in contact with cold currents. Fogs are mini clouds in which condensation takes place around nuclei provided by the dust, smoke, and the salt particles.

Cloud is a mass of minute water droplets or tiny crystals of ice formed by the condensation of the water vapour in free air at considerable elevations. According to their height, expanse, density and transparency or opaqueness clouds are grouped under four types :

  • cirrus
  • cumulus
  • stratus
  • nimbus.

Class 11 Geography Notes Chapter 11 Water in the Atmosphere 1

Cirrus clouds are formed at high altitudes (8,000-12,000m). They are thin and detatched clouds having a feathery appearance. They are always white in colour.

Cumulus clouds look like cotton wool. They are generally formed at a height of4,000-7,000 m. They exist in patches and can be seen scattered here and there. They have a flat base.

Stratus are layered clouds covering large portions of the sky. These clouds are generally formed either due to loss of heat or the mixing of air masses with different temperatures.

Nimbus clouds are black or dark gray. They form at middle levels or very near to the surface of the earth.

On the basis of origin, rainfall may be classified into three main types — the convectional, orographic or relief and the cyclonic or frontal.

Convectional rain takes place when the air on being heated, becomes light and rises up in convection currents. As it rises, it expands and loses neat and consequently, condensation takes place and cumulous clouds are formed. With thunder and lightening, heavy rainfall takes place but this does not last long.
Class 11 Geography Notes Chapter 11 Water in the Atmosphere 2
Orographic rain occurs when the saturated air mass comes across a mountain, it is forced to ascend and as it rises, it expands; the temperature falls, and the moisture is condensed. The chief characteristic of this sort of rain is that the windward slopes receive greater rainfall.

Different places on the earth’s surface receive different amounts of rainfall in a year and that too in different seasons. In general, as we proceed from the equator towards the poles, rainfall goes on decreasing steadily. The coastal areas of the world receive greater amounts of rainfall than the interior of the continents. The rainfall is more over the oceans than on the landmasses of the world.

Between the latitudes 35° and 40° N and S of the equator, the rain is heavier on the eastern coasts and goes on decreasing towards the west. But, between 45° and 65° N and S of equator, the rainfall is first received on the western margins of the continents and it goes on decreasing towards the east.

In some regions rainfall is distributed evenly throughout the year such as in the equatorial belt and in the western parts of cool temperate regions.

Distribution Of Clouds:

Classification of clouds on the basis of average heightSub-categories or types of cloudsFeatures or characteristics
High Clouds 5 km to 14 kmCirrusCirrus clouds are formed at high altitudes. They are soft and silk like shaped.
CirrostratusThey are thin and detatched clouds having a feathery appearance. They are always white in colour.
CorrocumulusThese clouds look like small white circular shaped. They do not have any shadow
Medium CloudsAltostratuThey are blue or brown in colour. They have fibres like look.
AltocumulusThese are flattened circles like clouds which are organised like waves.
Low CloudsStratocumulusSoft and brownish clouds in a group which have a shining.
NimobostratusThey are low and same layer clouds which look like fog but they are not stable on surface of the earth.
Clouds with extensive vertical developmentCumulusCumulus clouds look like cotton wool. They are generally formed at a height of 4,000-7,000 m. They exist in patches and can be seen scattered here and there. They have a flat base.
CumulonimbusThey are formed on mountains and cause rainfall.

 

Class 11 Geography Notes Chapter 11 Important Terms:

  • Humidity: Water vapour present in the air is known as humidity.
  • Evaporation: It is a process by which water is transformed from liquid to gaseous state. Heat is the main cause for evaporation.
  • Latent heat of vaporisation: The temperature at which the water starts evaporating is referred to as the latent heat of vaporisation.
  • Absolute humidity: The actual amount of the water vapour present in the atmosphere is known as the absolute humidity. It is the weight of water vapour per unit volume of air and is expressed in terms of grams per cubic metre.
  • Relative humidity: The percentage of moisture present in the atmosphere as compared to its full capacity at a given temperature is known as the relative humidity.
  • Dew points: The temperature at which saturation occurs in a given sample of air is known as dew point.
  • Dew: When the moisture is deposited in the form of water droplets on cooler surfaces of solid objects (rather than nuclei in air above the surface) such as stones, grass blades and plant leaves, it is known as dew.
  • Condensation: The transformation of water vapour into water is called condensation. Condensation is caused by the loss of heat.
  • Sublimation: When moist air is cooled, it may reach a level when its capacity to hold water vapour ceases. Then, the excess water vapour condenses into liquid form. If it directly condenses into solid form, it is known as sublimation.
  • Precipitation: After the condensation of water vapour, the release of moisture is known as precipitation. This may take place in liquid or solid form.
  • Rainfall: The precipitation in the form of water is called rainfall.
  • Snowfall: When the temperature is lower than the 0°C, precipitation takes place in the form of fine flakes of snow and is called snowfall.
  • Orographic rain: When the saturated air mass comes across a mountain, it is forced to ascend and as it rises, it expands; the temperature falls, and the moisture is condensed. It is also known as the relief rain.
  • Rain shadow area: The area situated on the leeward side, which gets less rainfall is known as the rain-shadow area.
  • Cyclonic rain: Rain caused by a cyclone is called cyclonic rain.
  • Hailstones: Sometimes, drops of rain after being released by the clouds become solidified into small rounded solid pieces of ice and which reach the surface of the earth are called hailstones.
  • Convectional rain: The air on being heated, becomes light and rises up in convection currents. As it rises, it expands and loses heat and consequently, condensation takes place and cumulous clouds are formed. With thunder and lightening, heavy rainfall takes place but this does not last for long.
  • Frost: Frost forms on cold surfaces when condensation takes place below freezing point (0°C), i.e. the dew point is at or below the freezing point.
  • Fog and Mist: When the temperature of an air mass containing a large quantity of water vapour falls all of a sudden, condensation takes place within itself on fine dust particles. So, the fog is a cloud with its base at or very near to the ground.
  • Smog: A condition when fog is mixed with smoke, is described as smog.
  • Clouds: Cloud is a mass of minute water droplets or tiny crystals of ice formed by the condensation of the water vapour in free air at considerable elevations. As the clouds are formed at some height over the surface of the earth, they take various shapes.

Class 11 Geography Notes

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NTSE Gujarat 2019-20 for Class X | Admit Card, Exam Dates, Pattern and Syllabus

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NTSE Gujarat 2019-20: Gujarat State Examination Board (GSEB) will conduct NTSE Gujarat Stage 1 on 3rd November 2019. Students who are currently studying in class X are eligible for NTSE Gujarat 2019-20. The application process will start from the first week of August till the third week of September 2019. Candidates who want to appear for the NTSE Gujarat can download their admit card in the third week of October 2019. The NTSE Gujarat exam is conducted in 2 stages. Stage 1 conducted by GSEB at the State level. Stage 2 conducted by NCERT at the National level. Only shortlisted candidates in the stage1  are entitled to appear for the stage 2 exam. The final merit list will be prepared and published based on the candidate’s entire performance.

NTSE Exam is conducted every year to recognize and encourage young talent in India. Finally, scholarships will be awarded to the deserving candidates by NTSE till the doctorate level of their academics. Candidates should read this article further to know more information about NTSE Gujarat 2019-20. Information such as exam dates, admit card, eligibility, exam pattern, and syllabus, etc.

NTSE Gujarat Exam Dates

NTSE EventsDates
Releasing of Application formThird week of August 2019
Closing of ApplicationThird week of September 2019
Admit Card for Stage 1Third week of October 2019
NTSE Gujarat Stage 1November 3, 2019
NTSE Gujarat Answer KeySecond Week of November 2019
NTSE Gujarat Stage 1 Result & Cut-off ScoresMarch 2020
NTSE Admit Card for Stage 2April 2020
NTSE Stage 2May 10, 2020
NTSE Stage 2 ResultSeptember 2020

NTSE Gujarat Eligibility Criteria

Candidates must fulfill the following eligibility criteria to appear for NTSE Gujarat 2019-20.

  • Age of the candidate should not be above 18 years as on 1st July 2019.
  • Candidate must be studying class X in the academic year of 2019-20.
  • Candidates who have appeared for the class X board exam in 2019 are not eligible.
  • Reserved category candidates must secure at least 55% marks in Class IX to be eligible for the exam.
  • General category candidates must secure at least 60% marks in class IX to be eligible for the exam.
  • NMMS scholarship holders are also eligible to appear for NTSE Gujarat.
  • Candidates who are studying in government, private or top schools are eligible.
  • Open schooling or distance learning candidates are also eligible.

NTSE Gujarat Application Form

NTSE Gujarat application form will be released by Gujarat Board in the 3rd week of August 2019. The closing date of NTSE Gujarat online application form is the third week of September 2019. Candidates can check the below mentioned important information to apply for the exam.

  • Candidates should visit the official website Sebexam.orpgujarat.com.
  • Candidates need to register themselves in order to fill the application form.
  • After registration candidate needs to enter all necessary details in the form.
  • Candidates have to keep ready of all their educational documents at the time of filling out the application form.
  • Candidates should use an only blue or black ballpoint pen to fill the necessary details.
  • Candidate should fill all the details correctly and recheck it to avoid rejection of the application.
  • After filling the details candidates need to upload their recent photo as well as some necessary documents in the given format.
  • Once the application is confirmed candidates need to take a hard copy of it.
  • Submit the application form along with the registration fee to the state liaison officer on or before the due date.

NTSE Gujarat Application Fee

The below mentioned is the application fee which needs to be submitted by the applicants on or before the due date in order to appear for the exam. The application fee can be deposited online by using a debit card, credit card or net banking. Once the application fee will be paid, it will not be refunded back.

CategoryApplication Fee
GeneralRs. 70/-
ReservedRs. 50/-

NTSE Gujarat Admit Card

Candidates can download their admit card from the official website at least 21 days before the exam date. Candidates must go through the following points to download the admit card.

  • Go to the NTSE Gujarat official website Sebexam.orpgujarat.com.
  • Click on the “Print Hall Pass” link.
  • Enter the NTSE application number and date of birth.
  • Candidate should fill application number details and click enter.
  • After that download and take a printout of the hall pass.

The NTSE Gujarat admit card contains candidate’s name, roll number, exam date & time and exam center details. It is important that candidates must carry their admit card on the exam day. Without admit card candidate will not be permitted to sit in the exam.

NTSE Gujarat Exam Pattern

The NTSE Gujarat stage 1 exam is divided into 2 sections. These are the Scholastic Ability Test (SAT) and the Mental Ability Test (MAT). Total of 200 questions is asked in the NTSE Gujarat stage 1. Each paper contains 100 questions. The following table shows the complete details on exam pattern for NTSE Gujarat.

PaperNumber of questionsQuestion TypesTime Allotted
Scholastic Ability Test (SAT)100 (Math – 20, Science – 40 and Social Science – 40)Multiple choices, objective type120 minutes
Mental Ability Test (MAT)100Multiple choices, objective type120 minutes
  • Each correct answer in the exam carries 1 mark while there is no negative marking for wrong answers.
  • SAT evaluates the candidate’s reading comprehension, interpretative, predictive and general knowledge.
  •  The total number of questions asked from math, science, and social science subjects in the SAT is 100 and the time allotted is 120 minutes.
  • The questions in the exam will be asked from the syllabus of class IX and X.
  • MAT evaluates the candidates reasoning, discriminate the ability of thinking, judging and visualizing.
  • MAT questions are based on logical reasoning, coding-decoding, problem-solving, series, analogies, hidden figures, pattern perception, etc.
  • The total number of questions asked in the MAT is 100 and the time allotted is 120 minutes.

NTSE Gujarat Answer Key

The answer key for the NTSE Gujarat will be released on the official website in the 2nd week of November 2019. The answer key contains correct answers of 100 questions that have been asked in MAT and SAT. Candidates from Gujarat can download the answer keys to verify the answers and calculate their scores. The following points are given to check the NTSE Gujarat Answer key:

  1. Candidate has to check the official website of GSEB. Then, click on the answer key link.
  2. Save the downloaded answer key.
  3. Candidates can compare the expected marks with last year’s cut-off.
  4. It will help the candidate to get an idea of whether he/she will be qualified to appear for NTSE stage 2 exam or not.
  5. The correct marking strategy should be followed. Candidates answer key can be revised based on significant proof.
  6. Finally, the revised answer key will be published.

NTSE Gujarat Exam Result

NTSE Gujarat exam result will be released by GSEB on the official website in March 2020. It contains marks obtained in SAT, MAT & the total marks of each candidate. GSEB will release the merit list of qualified candidates for NTSE stage 2 exam which will be conducted on May 10, 2020. Candidates should go through the following steps to check the NTSE Gujarat exam results:

  • Candidates can check their result on the official website of GSEB.
  • NTSE Gujarat Result 2019 link can be seen on the homepage of the portal, click on it.
  • Candidates should fill their roll number and date of birth and download the result list.
  • Candidates can keep the hard copies of the result list for their future reference.

Details Mentioned on NTSE Gujarat Exam Result

Candidates can check their NTSE Gujarat result on the official website Sebexam.orpgujarat.com. The NTSE Gujarat exam result contains the following information of the shortlisted candidates.

  • Name, Roll number and School Address of the candidate
  • Candidates scores in MAT & SAT
  • Candidates gender, caste category, date of birth and disability status
  • Total marks and Candidates Rank

NTSE Gujarat Stage 1 Cut-Off

Cut-off scores are the minimum scores a candidate needs to achieve to qualify for the NTSE stage 2 exam. NTSE Gujarat qualifying scores will be declared along with the result by GSEB on March 2020. Candidates must know that the qualifying scores depends on various factors as given below:

  • Number of candidates from each category
  • Maximum marks secured in the exam
  • Minimum marks secured in the exam

The following table shows the cut-off marks for NTSE Gujarat stage 1 category candidates

CategoryCut-Off
SC154
ST143
OBC159
General178

The following table shows the qualifying percentage for MAT & SAT for NTSE Gujarat stage 1 category candidates

PaperGeneral CategoryReserved Categories (ST, SC & PH)
MAT40%32%
SAT40%32%

NTSE Gujarat Stage 1 Reservation Criteria

Candidates must go through the following table to know the reservation criteria for NTSE Gujarat.

CategoryReservation Criteria
SC15%
ST7.5%
PH4%

NTSE Gujarat Stage 1 Syllabus

There is no specific syllabus for the NTSE Gujarat stage 1. So, candidates must refer to the CBSE class IX and X syllabus with the aim of getting selected in this exam. Candidates can also refer to the official PDF which gives information on MAT and SAT.

  • Scholastic Ability Test (SAT): It contains questions from math, science and social science subjects.
  • Mental Ability Test (MAT): It contains questions from logical reasoning and problem-solving skills.

Hope this article will help you to get more information about NTSE Gujarat 2019-20.

The post NTSE Gujarat 2019-20 for Class X | Admit Card, Exam Dates, Pattern and Syllabus appeared first on Learn CBSE.

Class 11 Geography Notes Chapter 2 Structure and Physiography

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Class 11 Geography Notes Chapter 2 Structure and Physiography

These geological regions broadly follow the physical features:

  • The Peninsular Block
  • The Himalayas and other Peninsular Mountains
  • Indo-Ganga-Brahmaputra Plain.

The northern boundary of the Peninsular Block may be taken as an irregular line running from Kachchh along the western flank of the Aravali Range near Delhi and then roughly parallel to the Yamuna and the Ganga as far as the Rajmahai Hills and the Ganga delta. Apart from these, the Karbi Anglong and the Meghalaya Plateau in the north-east and Rajasthan in the west are also extensions of this block.

The Peninsula is formed essentially by a great complex of very ancient gneisses and granites, which constitutes a major part of it. The rift valleys of the Narmada, the Tapi and the Mahanadi and the Satpura block mountains are some examples of it. The Peninsula mostly consists of relict and residual mountains like the Aravali hills, the Nallamala hills, the Javadi hills, the Veliconda hills, the Palkonda range and the Mahendragiri hills, etc.

Most of the east flowing rivers form deltas before entering into the Bay of Bengal. The deltas formed by the Mahanadi, the Krishna, the Kaveri and the Godavari are important examples.

The Himalayas along with other Peninsular mountains are young, weak and flexible in their geological structure unlike the rigid and stable Peninsular Block. Consequently, they are still subjected to the interplay of exogenic and endogenic forces, resulting in the development of faults, folds and thrust plains.

The third geological division of India comprises the plains formed by the river Indus, the Ganga and the Brahmaputra. Originally, it was a geo-synclinal depression which attained its maximum development during the third phase of the Himalayan mountain formation approximately about 64 million years ago. Since then, it has been gradually filled by the sediments brought by the Himalayan and Peninsular rivers. Average depth of alluvial deposits in these plains ranges from 1,000-2,000 m.

India can be divided into the following physio-graphic divisions:

  • The Northern and North-eastern Mountains
  • The Northern Plain
  • The Peninsular Plateau
  • The Indian Desert
  • The Coastal Plains
  • The Islands.

The North and North-eastern Mountains consist of the Himalayas and the North-eastern hills. The Himalayas consist of a series of parallel mountain ranges. Some of the important ranges are the Greater Himalayan range, which includes the Great Himalayas and the Trans-Himalayan range, the Middle Himalayas and the Shiwalik.
Class 11 Geography Notes Chapter 2 Structure and Physiography part b1
The approximate length of the Great Himalayan range, also known as the central axial range, is 2,500 km from east to west, and their width varies between 160-400 km from north to south.

On the basis of relief, alignment of ranges and other geomorphological features, the Himalayas can be divided into the following sub-divisions:

  • Kashmir or North-western Himalayas.
  • Himachal and Uttaranchal Himalayas.
  • Darjeeling and Sikkim Himalayas.
  • Arunachal Himalayas.
  • Eastern Hills and Mountains.

Kashmir or North-western Himalayas comprise a series of ranges such as the Karakoram, Ladakh, Zaskar and Pir Panjal. The north-eastern part of the Kashmir Himalayas is a cold desert, which lies between the Greater Himalayas and the Karakoram ranges.

The word shiwalik has its origin in the geological formation found in and around a place called Sivawala near Dehra Dun which was once a headquarter of the Imperial Survey and which subsequently established its permanent headquarters at Dehra Dun.

The Himachal and Uttarakhand Himalayas lies approximately between the Ravi in the west and the Kali (a tributary of Ghaghara) in the east. In this section of Lesser Himalayas, the altitude between 1,000-2,000 m specially attracted to the British colonial administration, and subsequently, some of the important hill stations such as Dharamshala, Mussoorie, Shimla, Kaosani and the cantonment towns and health resorts such as Shimla, Mussoorie, Kasauli, Almora, Lansdowne and Ranikhet, etc. were developed in this region.

The two distinguishing features of this region from the point of view of physiography are the ‘Shiwalik’ and ‘Dun formations’, Some important duns located in this region are the Chandigarh – Kalka Dun, Nalagarh Dun, Dehra Dun, Harike Dun and the Kota Dun.

In the Great Himalayan range, the valleys are mostly inhabited by the Bhotia’s. These are nomadic groups who migrate to ‘Bugyals’ (the summer glass lands in the higher reaches) during summer months and return to the valleys during winters. The famous ‘Valley of flowers’ is also situated in this region. The places of pilgrimage such as the Gangotri, Yamunotri, Kedarnath, Badrinath and Hemkund Sahib are also situated in this part.

Sikkim and Darjeeling Himalayas are also known for their scenic beauty and rich flora and fauna, particularly various types of orchids.

An important aspect of the Arunachal Himalayas is the numerous ethnic tribal community inhabiting in these areas. Some of the prominent ones from west to east are the Monpa, Daffla, Abor, Mishmi, Nishi and the Nagas. Most of these communities practise Jhumming. It is also known as shifting or slash and burn cultivation. This region is rich in biodiversity which has been preserved by the indigenous communities. Due to rugged topography, the inter-valley transportation linkages are nominal. Hence, most of the interactions are carried through the duar region along the Arunachal-Assam border.

The Eastern Hills and Mountains are having their general alignment from the north to the south direction. They are known by different local names. In the north, they are known as Patkai Bum, Naga hills, the Manipur hills and in the south as Mizo or Lushai hills. These are low hills, inhabited by numerous tribal groups practising Jhum cultivation.

The northern plains are formed by the alluvial deposits broiight by the rivers – the Indus, the Ganga and the Brahmaputra. These plains extend approximately 3,200 km from the east to the west. The average width of these plains varies between 150-300 km. The maximum depth of alluvium deposits varies between 1,000-2,000 m. From the north to the south, these can be divided into three major zones: the Bhabar, the Tarai and the alluvial plains. The alluvial plains can be further divided into the Khadar and the Bhangar.

Bhabar is a narrow belt ranging between 8-10 km parallel to the Shiwalik foothills at the break-up of the slope. As a result of this, the streams and rivers coming from the mountains deposit heavy materials of rocks and boulders, and at times, disappear in this zone. South of the Bhabar is the Tarai belt, with an approximate width of 10-20 km where most of the streams and rivers re-emerge without having any properly demarcated channel, thereby, creating marshy and swampy conditions known as the Tarai.

Northern Plains is a featureless plain with a general elevation of 50-150 m above the mean sea level. The states of Haryana and Delhi form a water divide between the Indus and the Ganga river systems.

Rising from the height of 150 m above the river plains up to an elevation of 600-900 m is the irregular triangle known as the Peninsular plateau. Delhi ridge in the northwest, (extension of Aravalis), the Rajmahal hills in the east, Gir range in the west and the Cardamom hills in the south constitute the outer extent of the Peninsular plateau. However, an extension of this is also seen in the northeast, in the form of Shillong and Karbi-Anglong plateau. The Peninsular India is made up of a series of patland plateaus such as the Hazaribagh plateau, the Palamu plateau, the Ranchi plateau, the Malwa plateau, the Coimbatore plateau and the Karnataka plateau, etc.

On the basis of the prominent relief features, the Peninsular plateau can be divided into three broad groups:

  • The Deccan Plateau
  • The Central Highlands
  • The North-eastern Plateau.

The Deccan Plateau is bordered by the Western Ghats in the west, Eastern Ghats in the east and the Satpura, Maikal range and Mahadeo hills in the north. Western Ghats are locally known by different names such as Sahyadri in Maharashtra, Nilgiri hills in Karnataka and Tamil Nadu and Anaimalai hills and Cardamom hills in Kerala. Western Ghats are comparatively higher in elevation and more continuous than the Eastern Ghats. Their average elevation is about 1,500 m with the height increasing from north to south. ‘Anaimudi (2,695 m), the highest peak of Peninsular plateau is located on the Anaimalai hills of the Western Ghats followed by Dodabetta (2,637 m) on the Nilgiri hills.

Some of the important ranges in Eastern Ghats include the Javadi hills, the Palconda . range, the Nallamala hills, the Mahendragiri hills, etc.

The Meghalaya plateau is further sub-divided into three:

  • The Garo Hills
  • The Khasi Hills
  • The Jaintia Hills

These are named after the tribal groups inhabiting this region. An extension of this is also seen in the Karbi Anglong hills of Assam.

To the north-west of the Aravali hills lies the Great Indian Desert. It is a land of undulating topography dotted with longitudinal dunes and barchans. This region receives low rainfall below 150 mm per year; hence, it has arid climate with low vegetation cover.

On the basis of the location and active geomorphological processes, it can be broadly divided into two:

  • The western coastal plains
  • The eastern coastal plains.

There are two major island groups in India – one in the Bay of Bengal and the other in the Arabian Sea. The Bay of Bengal island groups consist of about 572 islands/islets. These are situated roughly between 6°N-14°N and 92°E -94°E. The two principal groups of islets include the Ritchie’s archipelago and the Labrynth island.

Some important mountain peaks in Andaman and Nicobar islands are Saddle peak (North Andaman – 738 m), Mount Diavolo (Middle Andaman – 515 m), Mount Koyob (South Andaman – 460 m) and Mount Thuiller (Great Nicobar – 642 m). These islands are located at a distance of 280 km-480 km off the Kerala coast. The entire island group.is built of coral deposits. There are approximately 36 islands of which 11 are inhabited. Minicoy is the largest island with an area of 453 sq. km.

Class 11 Geography Notes Chapter 2 Important Terms:

  • Physiography: ‘Physiography’ of an area is the outcome of structure, process and the stage of development.
  • Central axial range: The approximate length of the Great Himalayan range is known as the central axial range. It is 2,500 km from east to west
  • Indo-Ganga-Brahmaputra Plain: It is a geological division of India that comprises the plains formed by the river Indus, the Ganga and the Brahmaputra.
  • Bhabar: Bhabar is a narrow belt ranging between 8-10 km parallel to the Shiwalik foothills at the break-up of the slope. As a result of this, the streams and rivers coming from the mountains deposit heavy materials of rocks and boulders, and at times, disappear in this zone.
  • Kashmir or North-western Himalayas: It comprise a series of ranges such as the Karakoram, Ladakh, Zaskar and Pir Panjal. The north-eastern part of the Kashmir Himalayas is a cold desert, which lies between the Greater Himalayas and the Karakoram ranges.
  • Duns: The southernmost part of this region consists of longitudinal valleys. These are known as ‘duns’. Jammu dun and Pathankot dun are important examples.
  • Tarai: South of the Bhabar is the Tarai belt, with an approximate width of 10-20 km where most of the streams and rivers re-emerge without having any properly demarcated channel, thereby, creating marshy and swampy conditions known as the Tarai.
  • Bhangar: The south of Tarai is a belt consisting of old alluvial deposits which is known as the Bhangar.
  • Khadar: The south of Tarai is a belt consisting of new alluvial deposits is known as Khadar.
  • Dhaoladhar: The Lesser Himalayas is locally known as Dhaoladhar in Himachal Pradesh.
  • Nagtibha: The Lesser Himalayas are called Nagtibha in Uttarakhand.
  • Ten Degree Channel: The Andaman in the north and the Nicobar in the south are separated by a water body. It is called the Ten degree channel.
  • The Peninsular Plateau: Rising from the height of 150 m above the river plains upto an elevation of 600-900 m is the irregular triangle known as the Peninsular plateau.
  • The Central Highlands: They are bounded to the west by the Aravali range.
  • Satpura Range: The Satpura range is formed by a series of scarped plateaus on the south, generally at an elevation varying between 600-900 m above the mean sea level.
  • Barchans: The extension of the Peninsular plateau can be seen as far as Jaisalmer in the West, where it has been covered by the longitudinal sand ridges and crescent-shaped sand dunes. These are called barchans.
  • Loktak: The physiography of Manipur is unique by the presence of a large lake known as ‘Loktak’.
  • Molassis Basin: Mizoram is also known as the ‘Molassis basin’ which is made up of soft unconsolidated deposits.
  • Kayals: Boatwaters are called kayals in Kerala.
  • Karewas: Karewas are the thick deposits of glacial clay and other materials embedded with moraines.
  • Dhaya: Bangal is called dhaya in Punjab.
  • Bate: Khadar is called bate in Punjab.

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 3 Drainage System

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Class 11 Geography Notes Chapter 3 Drainage System

On the basis of discharge of water (orientations to the sea), it may be grouped into:

  • The Arabian Sea drainage; and
  • The Bay of Bengal drainage.

Nearly 77 per cent of the drainage area consisting of the Ganga, the Brahmaputra, the Mahanadi, the Krishna, etc. are oriented towards the Bay of Bengal while 23 per cent comprising the Indus, the Narmada, the Tapi, the Mahi and the Periyar systems discharge their waters in the Arabian Sea.

On the basis of the size of the watershed, the drainage basins of India are grouped into three categories:

  • Major river basins with more than 20,000 sq. km of catchment area. It includes 14 drainage basins such as the Ganga, the Brahmaputra, the Krishna, the Tapi, the Narmada, the Mahi, the Penner, the Sabarmati, the Barak, etc.
  • Medium river basins with catchment area between 2,000-20,000 sq. km incorporating 44 river basins such as the Kalindi, the Periyar, the Meghna, etc.

Minor river basins with catchment area of less than 2,000 sq. km include fairly good number of rivers flowing in the area of low rainfall.

The Indus System is one of the largest river basins of the world, covering an area of 11,65,000 sq. km (in India it is 321, 289 sq. km) and a total length of 2,880 km and in India its length is 1,114 km.

The Jhelum, an important tributary of the Indus, rises from a spring at Verinag situated at the foot of the Pir Panjal in the south-eastern part of the valley of Kashmir. It flows through Srinagar and the Wular lake before entering Pakistan through a deep narrow gorge. It joins the Chenab near Jhang in Pakistan.

The Chenab is the largest tributary of the Indus. It is formed by two streams, the Chandra and the Bhaga, which join at Tandi near Keylong in Himachal Pradesh. Hence, it is also known as Chandrabhaga.

The Ravi is another important tributary of the Indus. It rises west of the Rohtang pass in the Kullu hills of Himachal Pradesh and flows through the Chamba valley of the state.

The Beas is another important tributary of the Indus, originating from the Beas Kund near the Rohtang Pass at an elevation of 4,000 m above the mean sea level. The river flows through the Kullu valley and forms gorges at Kati and Largi in the Dhaoladhar range.
Class 11 Geography Notes Chapter 3 Drainage System partb1
Satluj river flows almost parallel to the Indus for about 400 km before entering India, and comes out of a gorge at Rupar. It passes through the Shipki La on the Himalayan ranges and enters the Punjab plains. It is an antecedent river. It is a very important tributary as it feeds the canal system of the Bhakra Nangal project.

The Ganga System rises in the Gangotri glacier near Gaumukh (3,900 m) in the Uttarkashi district of Uttarakhand. Here, it is known as the Bhagirathi. It cuts through the Central and the Lesser Himalayas in narrow gorges. At Devprayag, the Bhagirathi meets the Alaknanda; hereafter, it is known as the Ganga. The Alaknanda has its source in the Satopanth glacier above Badrinath.

The Alaknanda consists of the Dhauli and the Vishnu Ganga which meet at Joshimath or Vishnu Prayag. The other tributaries of Alaknanda such as the Pindar joins it at Kama Prayag while Mandakini or Kali Ganga meets it at Rudra Prayag.

The Ganga river has a length of 2,525 km. It is shared by Uttarakhand (110 km) and Uttar Pradesh (1,450 km), Bihar (445 km) and West Bengal (520 km).

The Ganga basin covers about 8.6 lakh sq. km area in India alone. The Ganga river system is the largest in India having a number of perennial and non-perennial rivers originating in the Himalayas in the north and the Peninsula in the south, respectively. The Son is its major right bank tributary. The important left bank tributaries are the Ramganga, the Gomati, the Ghaghara, the Gandak, the Kosi and the Mahananda.

The Yamuna is the western most and the longest tributary of the Ganga. It has its source in the Yamunotri glacier on the western slopes of Banderpunch range (6,316 km). It joins the Ganga at Prayag in Allahabad. It is joined by the Chambal, the Sind, the Betwa and the Ken on its right bank which originates from the Peninsular plateau while the Hindan, the Rind, the Sengar, the Varuna, etc. join it on its left bank.
Class 11 Geography Notes Chapter 3 Drainage System partb2
Class 11 Geography Notes Chapter 3 Drainage System partb3
Class 11 Geography Notes Chapter 3 Drainage System partb4
The Chambal rises near Mhow in the Malwa plateau of Madhya Pradesh and flows northwards through a gorge up wards of Kota in Rajasthan, where the Gandhisagar dam has been constructed. From Kota, it traverses down to Bundi, Sawai Madhopur and Dholpur, and finally joins the Yamuna.

The Gandak comprises two streams, namely Kaligandak and Trishulganga. It rises in the Nepal Himalayas between the Dhaulagiri and Mount Everest and drains the central part of Nepal.

The Brahmaputra is one of the largest rivers of the world. It has its origin in the Chemayungdung glacier of the Kailash range near the Mansarovar lake.

The Brahmaputra receives numerous tributaries in its 750 km long journey through the Assam valley. Its major left bank tributaries are the Burhi Dihing and Dhansari (South) whereas the important right bank tributaries are the Subansiri, Kameng, Manas and Sankosh.. The Subansiri which has its origin in Tibet, is an antecedent river.

The Peninsular drainage system is older than the Himalayan one. This is evident from the broad, largely-graded shallow valleys, and the maturity of the rivers.

Most of the major Peninsular rivers except Narmada and Tapi flow from west to east. The Chambal, the Sind, the Betwa, the Ken, the Son, originating in the northern part of the Peninsula belong to the Ganga river system. The other major river systems of the Peninsular drainage are – the Mahanadi, the Godavari, the Krishna and the Kaveri. Peninsular rivers are characterised by fixed course, absence of meanders and non- perennial flow of water.

Three major geological events in the distant past have shaped the present drainage systems of Peninsular India:

  • Subsidence of the western flank of the Peninsula leading to its submergence below the sea during the early tertiary period.
  • Upheaval of the Himalayas when the northern flank of the Peninsular block was subjected to subsidence and the consequent trough faulting.
  • Slight tilting of the Peninsular block from north-west to the south-eastern direction gave orientation to the entire drainage system towards the Bay of Bengal during the same period.

There are some problems in river water usage. Some of these are:

  • No availability in sufficient quantity.
  • River water pollution.
  • Load of silt in the river water.
  • Uneven seasonal flow of water.
  • River water disputes between states.
  • Shrinking of channels due to the extension of settlements towards the thalweg.

Class 11 Geography Notes Chapter 3 Important Terms:

  • Drainage: The flow of water through well-defined channels is known as ‘drainage.’
  • Drainage System: The network of drainage channels is called a ‘drainage system’.
  • Dendritic Drainage System: The drainage pattern resembling the branches of a tree is known as “dendritic” the examples of which are the rivers of northern plain.
  • Radial Drainage System: When the rivers originate from a hill and flow in all directions, the drainage pattern is known as ‘radial’. The rivers originating from the Amarkantak range present a good example of it.
  • Trellis: When the primary tributaries of rivers flow parallel to each other and secondary tributaries join them at right angles, the pattern is known as ‘trellis’.
  • Centripetal Drainage System: When the rivers discharge their waters from all directions in a lake or depression, the pattern is known as ‘centripetal’.
  • Catchment area: A river drains the water collected from a specific area, which is called its ‘catchment area’.
  • Drainage Basin: An area drained by a river and its tributaries is called a drainage basin.
  • Watershed: The boundary line separating one drainage basin from the other is known as the watershed.
  • Sorrow of Bengal: River Damodar is also known as the ‘Sorrow of Bengal’ as it changes its course very frequently and causes floods in Bihar.
  • Sorrow of Bihar: River Kosi is called Sorrow of Bihar.
  • River System: A river or a river system is a body of water flowing in a channel through the surface of the earth. It consists of four important parts: river course, river source, tributaries and river mouth.
  • River Source: A place at which begins or originates. This is usually found in mountainous areas. The source may be melting snow from the top of a mountain on a lake with stream flowing out of it. A river flow downhill from its source due to the force of gravity
  • River Course: The path on which the river flows along.
  • Singi Khamban or Lion’s mouth: Kailash Mountain range is known as ‘Singi Khamban; or Lion’s mouth in Tibet.
  • Regime: The pattern of flow of water in a river channel over a year is known as its regime.
  • Cusecs: It means cubic feet per second.
  • Cumecs: It stands for cubic metres per second.

Class 11 Geography Notes

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Important Questions for Class 12 History Chapter 4 Thinkers, Beliefs and Buildings (Cultural Developments)

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Important Questions for Class 12 History Chapter 4 Thinkers, Beliefs and Buildings (Cultural Developments)

Important Questions for Class 12 History Chapter 4 – 2 Marks Questions

Question 1.
Why are Buddhist stupas said to be “stories in stone”? Explain. (HOTS, All India 2016)
Answer:
Each Buddhist stupa has a history of its own. The sculptures in the stupas depicted different stories which were taken from different texts at that time. Art historians have identified that the sculpture at Sanchi was a scene from the Vessantara Jataka. Often historians tried to understand the meaning of sculpture by comparing it with textual evidence.

Question 2.
How was Buddha’s presence shown through symbols? Give two examples. (Delhi 2010)
Answer:
Examples to show Buddha’s presence shown through symbols are:

  • The empty seat indicated the meditation of the Buddha.
  • The stupas represented the mahaparinibbana of the Buddha.

Question 3.
Mention the internal functioning of the Buddhist Sanghas. (All India 2010)
Answer:
The internal functioning of Buddhist Sangha was based on the traditions of ganas and sanghas. Within the sangha, there were equal status given to all of them because they shed their earlier social identities on becoming bhikkhus and bhikkhunis.
Women were included later in the sanghas.

The bhikkhus in the sangha had to observe certain rules such as to abide by their duties, such as a bowl to receive food once a day from the ordinary people. Consensus was arrived on all issues through discussions. All decisions were taken with the majority opinion or by a vote on the subject.

Question 4.
Name the two types of sources through which we come to know about Buddha and his teachings. (Delhi 2008)
Answer:
Two sources through which we come to know about Buddha and his teachings are as follows:

  • Various Buddhist texts like Tripitakas or three baskets and the Jataka stories.
  • Various pillar inscriptions and rock edicts.

Important Questions for Class 12 History Chapter 4 – 4 Marks Questions

Question 5.
How was the fate of Amaravati stupa different from the Sanchi stupa? Explain. (All India 2016)
or
Critically examine why Sanchi survived while Amaravati did not? HOTS, (All India 2010)
Answer:
The stupa at Amaravati was one of the largest and the most significant among the Buddhist stupas. The stupa at Sanchi survived while Amaravati did not. Ther reasons are:

  • It is said that the stupa at Amaravati was discovered sometime earlier than the one at Sanchi.
  • Perhaps, the scholars were not aware of the significance of preserving the archaeological remains at the site where they were originally found.
  • The Sanchi stupa Was discovered in the year 1818. At that time, three of its four gateways were still standing, the fourth was lying on the spot and the mound was in good condition.

But from the Amaravati, several pieces of sculptures were already used by the British administration in London to decorate the gardens. There was an insignificant little mound and was totally denuded of its former glory.

Question 6.
“Many rituals, religious beliefs and practices were not recorded in a permanent visible form as monuments or sculptures or even paintings”. Critically examine the statement. (HOTS, All India 2012)
Answer:
Many rituals, religious beliefs and practices were not recorded in a permanent visible form as monument, sculptures or even paintings.
This can be understood through the following points:

  • There are many communities and people who may not have known to keep records for their rituals, religious beliefs and practices.
  • However, they may had vibrant traditions of religious activities and their own philosophical ideas.
  • Generally, people want to record those things which are clearly visible. They do not feel urgency to record their daily practices about religion and philosophy.

Thus, we have a partial view of the rich visual traditions that were presented in the form of sculpture, architecture and paintings and any of these sculptures were damaged over the centuries. But beyond these, there is a vast history of men which is not yet recorded.

Question 7.
Describe the teachings of the Buddha. (Delhi 2011)
or
Describe how Buddha’s teachings have been reconstructed from the stories of Sutta Pitaka? All India 2011
or
Write down the eternal truth of Buddhism. (All India 2009)
or
Explain briefly the teachings of Buddha. (Delhi 2008)
Answer:
The teachings of Buddha are as follows:

  • The world is transient (anicca) and constantly changing. It is also soulless as there is nothing permanent or eternal in it.
  • Within this transient world, sorrow (dukkha) is intrinsic to human existence.
  • By following the path of moderation between severe penance and self-indulgence, human beings can use above these worldly pleasures.
  • He advised kings and gahapatis to be humane and ethical. Buddha regarded the social world as the creation of humans rather than of divine origin.
  • He emphasised individual agency and righteous action as the means to escape from the cycle of rebirth and attain self-realisation and nibbana (literally means the extinguishing of ego and desire).
    This ends the cycle of suffering for those who renounced the world.
  • The words to his followers were “Be lamps into yourselves as all of you must work out your own liberation.”

Question 8.
Describe how the Buddha’s teachings have been reconstructed from the stories of Sutta Pitaka. (All India 2011)
Answer:
The Buddha’s teachings have been reconstructed from the stories found mainly in the Sutta Pitaka in the following ways:

  • Although some stories suggest the Buddha’s miraculous powers, others suggest that the Buddha tried to convince people through reason and persuasion rather than through displays of supernatural powers.
  • When a grief-stricken woman, whose child had died, came to the Buddha, he sympathetically convinced her about the inevitability of death rather than bring her son back to life. These types of stories were narrated in the language spoken by ordinary people, so that they could easily understand.
  • In Sutta Pitaka, the Buddha explained five ways through which a master could look after his servants and employees. These were:
    • by assigning them work according to their strength.
    • by supplying them with food and wages.
    • by tending them in sickness.
    • by sharing delicacies with them.
    • by granting leaves at times.
  • In Sutta Pitaka, there were instructions about how to behave with parents, teachers and wife.

Question 9.
Describe briefly the early stupas at Sanchi and Bharhut. (Delhi 2009)
Answer:
The early stupas at Sanchi and Bharhut were built in the 2nd century BCE. The main features of these stupas were:

  • These were plain except for the stone railings, which resembled a bamboo or wooden fence. The gateways of these stupas were richly carved and installed at the four cardinal points.
  • Worshippers entered through the Eastern gateway and walked around the mound in a clockwise direction, keeping the mound on the right, imitating the sun’s course through the sky.
  • Later, the mound of the stupas made to be elaborately carved with niches and sculptures, like Amaravati and Shahji-Ki-Dheri in Peshawar.
  • An elevation of the great stupas of Sanchi provides a vertical perspective.

Important Questions for Class 12 History Chapter 4 – 8 Marks Questions

Question 10.
Explain the structural and sculptural features of the Sanchi stupa. (Delhi 2015)
Answer:
The Sanchi stupa was built in the 2nd century BCE and regarded as one of the important stupas in India. It was discovered in 1888.
The structural features of the Sanchi stupa are:

  • The stupa originated as a simple semi-circular mound of Earth, later called Anda. Above the anda was the harmika, a balcony-like structure that represented the abode of the Gods. There was a mast called the yashti, arising from the harmika and it was surmounted by a chhatri or umbrella.
  • Around the mound, there was a railing, separating the sacred space from the world. There were stone railings and the gateways, which were richly carved and installed at the four cardinal points.
  • An elevation of the great stupa provides a vertical perspective.

The sculptural features of the Sanchi stupa are:

  • Art historians identified the scene depicted in the gateways as a scene from the Vessantara Jataka. They often try to understand the meaning of sculpture by comparing it with textual evidence.
  • Many symbols like empty seat, wheel, tree were used to indicate the different teachings of Buddhism in Sanchi stupa. For instance, the empty seat was meant to represent the mahaparinibbana.
    Wheel stood for the first sermon of Buddha.
  • Other sculptures at Sanchi were perhaps not directly inspired by Buddhist ideas. These figures included beautiful women swinging from the edge of the gateway holding into a tree, like, Shalabhanjika was a woman whose touch caused trees to flower and bear fruit.
  • There are other images in Sanchi stupa. Depiction of animals like elephants, horses, monkeys and cattle were found there. Animals were used as symbols of human attributes, e.g. elephants were depicted to signify strength and wisdom.
  • There is a motif in Sanchi stupa of a woman surrounded by lotuses and elephants, which seems to be sprinkling water on her as if performing an Abhisheka or consecration. It has been identified by some historians as Maya, the mother of Buddha while others identify her with a popular Goddess Gajalakshmi (Goddess of good fortune).

Question 11.
How did Sutta Pitaka reconstruct the philosophy of Buddhism? Mention about Buddhist Tipitaka. (HOTS; All India 2015)
Answer:
After the death of Buddha, his teachings were compiled by his disciples and were known as Tipitaka. Sutta-Pitaka was one of the Tipitaka.
The main features of Sutta Pitaka are:
1. The Buddha’s teachings have been reconstructed from stories found mainly in the Sutta Pitaka. Some stories ’ describe his miraculous powers and
other stories suggest that the Buddha tried to convince people through reason and persuasion, rather than through displays of supernatural power. Sometimes, through stories, the teachings of the Buddha were narrated in the language spoken by common men, so that individual effort was expected to transform social relations.

2. The Buddha emphasised individual agency and righteous action as the means to escape from the cycle of rebirth and attain self-realisation and nibbana. By extinguishing ego and desire, individual could end the cycle of his . sufferings and renounce the world.

Tipitaka literally means three baskets to hold different types of texts.
The main features of it are:

  • The Vinaya Pitaka included rules and regulations for those who joined the Sangha or monastic order.
  • The Sutta Pitaka included the teachings of the Buddha.
  • The Abhidhamma Pitaka dealt with philosophical matters. Each pitaka comprised a number of texts.
  • According to Buddhist philosophy the world is transient (anicca) and constantly changing. The world is soulless (anatta) as there is nothing permanent or eternal in it.
  • Within this transient world, sorrow (dukkha) is intrinsic to human existence. It is by following the path of moderation between severe penance and self-indulgence, the human beings can rise above these worldly troubles.
  • The Buddha regarded the social world as the creation of humans rather than of divine origin. Therefore, he advised kings and gahapatis to be humane and ethical.

Question 12.
Discuss how and why were stupas built? (All India 2013,2008)
Answer:
The stupas were built with donation made for building them. The kings such as Satavahanas, wealthy persons, guilds of the merchants and artisans and even monks, common men and nuns made donation for building stupas. We find records of donations that were made for building and decorating the stupa on the railings and pillars of the stupas. The inscriptions also mention the names of hundreds of donors and sometimes the name of the place from where they came, their occupations and names of their relatives as well. For instance, one of the gateways at Sanchi was built with the money donated by the guilds of ivory-workers.

The stupas were regarded as sacred place and the relics of Buddha i.e. his bodily remains or objects used by him were buried here. These mounds were known as stupas. The tradition of building stupas may have been pre-Buddhist, but they attained much popularity as an emblem of both the Buddha and Buddhism.

The scholars find a mention of ‘Ashokavadana’ a Buddhist text, in that Asoka distributed portions of the Buddha’s relics to every important town and ordered the construction of stupas over them. By the 2nd century BCE, a large number of stupas including those at Bharhut, Sanchi and Sarnath were built.

Important Questions for Class 12 History Chapter 4 Source Based Questions

Question 13.
Buddhism in Practice
This is an excerpt from the Sutta Pitaka, and contains the advice given by the Buddha to a wealthy householder named Sigala.
In five ways should a master look after his servants and employees… by assigning them work according to their strength, by supplying them with food. and wages, by tending them in sickness; by sharing delicacies with them and by granting leave at times …
In five ways should the clansmen look after the needs of Samanas (those who have renounced the world) and Brahmanas; by affection in act and speech and mind, by keeping open house to them and supplying their worldly needs.
There are similar instructions to Sigala about how to behave with his parents, teacher and wife.
1. In what ways should a master look after his servants and employees? (All India 2017)
or
What advice was given by Buddha to Sigala regarding relationship between a master and his servants and employees? (Delhi 2013)
2. In what ways should the clansmen look after the needs of Samanas? (All India 2017)
or
List the instructions given by Buddha to the clansmen for Samanas and Brahmanas. (Delhi 2013)
3. Explain the main aspects of Buddhist philosophy. (All India 2017)
or
According to you what suggestion Buddha would have advocated regarding parents and teachers? (Delhi 2013)
Answer:
1. The advice given by Buddha to Sigala regarding relationship between a master and his servants and employees are:

  • A master should look after his servants and employees in five ways.
  • He should assign them work according to their strength, by supplying them with food and wages.
  • A master should tend them in sickness, by sharing delicacies with them and by-granting leave at times.

2. The instructions given by Buddha to the clansmen for Samanas and Brahmanas are:

  • The clansmen should look after the needs of Samanas (those who have renounced the world) and Brahmanas in five ways.
  • The clansmen should have affection in act and speech and mind by keeping open to house.
  • The clansmen should also fulfil the worldly needs of Samanas and Brahmanas.

3. The suggestions Buddha would have advocated regarding parents and teachers are similar. According to Buddha, parents and teachers ought to be respected and their needs should be fulfilled with grace and dignity.

Question 14.
Why were Stupas Built?
This is an excerpt from the Mahaparinibbana Sutta, part of the Sutta Pitaka. As the Buddha lay, dying Ananda asked him “What are we to do Lord, with the remains of the Tathagata (another name for the Buddha)?” The Buddha replied, “Hinder not yourselves Ananda by honouring the remains of the Tathagata. Be zealous, be intent on your own good.”
But when pressed further, the Buddha said, “At the four crossroads, they should erect a thupa (Pali for stupa) to the Tathagata. And whosoever shall there place garlands or perfume…. or make a salutation there, or become in its presence calm of heart, that shall long be to them for a profit and joy.”

  1. Why were the stupas built?
  2. What Asoka did with the relics of Buddha?
  3. Describe the structure of the stupas. (All India 2009)

Answer:
1. Stupas were built because the relics of Buddha such as his bodily remains or objects used by him were buried there. These mounds were called stupas which came to be associated with Buddhism.

2. Asoka distributed portions of Buddha’s relics to every important town and ordered the construction of stupas over them.

3. Structure of stupas is as follows:

  • Anda: It is a semi-circular mound of Earth called anda.
  • Harmika: Above anda was the harmika, a balcony-like structure that represented the abode of the Gods.
  • Yashti: Arising from harmika was a mast called yashti. It was surmounted by a chhatri or umbrella.
  • Railing: Around the mound was a railing which separated the sacred place from the secular world.

Important Questions for Class 12 History Chapter 4 Map Based Questions

Question 15.
In the outline map of India, three places which are major Buddhist sites have been marked as A, B and C. Identify them and write their correct names on the lines drawn near them. (All India 2017)
Important Questions for Class 12 History Chapter 4 Thinkers, Beliefs and Buildings (Cultural Developments) Q15
Answer:
Important Questions for Class 12 History Chapter 4 Thinkers, Beliefs and Buildings (Cultural Developments) Q15(i)

Question 16.
On the given political map of India, locate and label the following.

  1. Bodhgaya. (All India 2014 )
  2. Lumbini. (Delhi Board 2014)
  3. Sanchi. (Delhi Board 2011)

Answer:
Important Questions for Class 12 History Chapter 4 Thinkers, Beliefs and Buildings (Cultural Developments) Q16

Important Questions for Class 12 History Chapter 4 Value Based Questions

Question 17.
“The mid first millennium BCE is often regarded as a major turning point in the world history.” Justify. (Delhi 2016)
Answer:
The mid first millennium BCE is often regarded as a major turning point in world history because of the following facts:

  • Emergence of Thinkers: It saw the emergence of thinkers such as Zarathustra in Iran, Kong Zi in China, Socrates, Plato and Aristotle in Greece and Mahavira and Gautam Buddha among others in India.
  • Understanding of the Mysteries of Existence: Thinkers tried to understand the mysteries of existence and the relationship between human beings and the cosmic order.
  • Development of New Kingdoms and Cities: It was the time when new kingdoms and cities were developing.
  • Change in Social and Economic Life: Social and economic life were changing in a variety of ways, e.g. in the Ganga valley growth of town, new crafts and trade took place.
  • New Agricultural Technology: There was extension of agriculture due to occupation of new lands, application of new techniques and use of iron tools.

Question 18.
“Buddha laid stress on right conduct and values.”
In the light of the above message, explain his teachings of life. (Delhi 2014)
Answer:
The teachings of Buddha are as follows:

  • The world is transient (anicca) and constantly changing. It is also soulless as there is nothing permanent or eternal in it.
  • Within this transient world, sorrow (dukkha) is intrinsic to human existence.
  • By following the path of moderation between severe penance and self-indulgence, human beings can use above these worldly pleasures.
  • He advised kings and gahapatis to be humane and ethical. Buddha regarded the social world as the creation of humans rather than of divine origin.
  • He emphasised individual agency and righteous action as the means to escape from the cycle of rebirth and attain self-realisation and nibbana (literally means the extinguishing of ego and desire).
    This ends the cycle of suffering for those who renounced the world.
  • The words to his followers were “Be lamps into yourselves as all of you must work out your own liberation.”

Question 19.
“The principle of ahimsa and renunciation emphasised by Jainism has left its mark.” Support the statement with Lord Mahavira’s messages. (Delhi 2013)
Answer:
The most important idea of Jainism is that the entire world is animated, even stones, rocks and water have life. In Jainism, the principle of ahimsa is emphasised. Jainism focuses on non-injury to living beings especially to humans, plants and insects.

Impacts of Jainism on Indian thinking are:

  • The idea of ahimsa left its mark on Indian thinking on the whole especially the thinking of Buddha and Gandhiji.
  • It also influenced Indian thinking in the light of the cycle of birth and rebirth through karma and renouncing the world to free oneself from the cycle of karma. In this respect, asceticism and penance are required.
  • From the perspective of morality, vows like not to steal, kill, lie or possess property and observing celibacy were emphasised, which is easily evident in Indian thinking.
  • It has stressed on simple way of life.
  • Vegetarianism’has also been derived from this thinking.

Question 20.
Read the following passage and answer the questions that follow.
According to these traditions, Siddhartha, as the Buddha was named at birth, was the son of a chief of the Sakya clan. He has a sheltered upbringing within the palace, insulated from the harsh realities of life. One day he persuaded his charioteer to take him into the city. His first journey into the world outside was traumatic. He was deeply anguished when he saw an old man, a sick man and a corpse. He realised in that moment that the decay and destruction of the human body was inevitable. He also saw a homeless mendicant, who, it seemed to him, had come to terms with old age, disease and death, and found peace. Siddhartha decided that he too would adopt the same path. Soon after, he left the palace and set out in search of his own truth.

  1. Who was Siddhartha?
  2. Which truths of life changed the life of Siddhartha?

Answer:
1. Siddhartha, as the Buddha was named at birth, was the son of a chief of the Sakya clan. He has a sheltered upbringing within the palace, insulated from the harsh realities of life.

2. One day Siddhartha went on to a journey into the city with his charioteer. This journey changed the life of Siddhartha. He was deeply anguished when he saw an old man, a sick man and a corpse. He realised in that moment that the decay and destruction of the human body was inevitable. He also saw a homeless mendicant, who, it seemed to him, had come to term with old age, disease and death, and found peace. Siddhartha decided that he too would adopt the same path. Soon after, he left the palace and set out in search of his own truth.

Question 21.
Read the following passage and answer the questions that follow.
Soon there grew a body of disciples of the Buddha and he founded a sangha, an organisation of monks who too became * teachers of dhamma. These monks lived simply, possessing only the essential requisites for survival, such as a bowl to receive food once a day from the laity. As they lived on alms, they were known as bhikkhus.
Initially, only men were allowed into the sangha, but later women also came to be admitted. According to Buddhist texts, this was made possible through the mediation of Ananda, one of the Buddha’s dearest disciples, who
persuaded him to allow women into the sangha. The Buddha’s foster mother, Mahapajapati Gotami was the first woman to be ordained as a bhikkhuni. Many women who entered the sangha became teachers of dhamma and went on to become theris, or respected women who had attained liberation.

  1. What were the attributes of Buddhist monks?
  2. How did women come to be admitted in sangha? What was the position of women in this sangha?

Answer:
1. The attributes of Buddhist monks are:

  • Buddhist monks were the disciples of the Buddha for whom he founded a sangha.
  • In this organisation, these monks were the teachers of dhamma.
  • These monks lived simply, possessing only the essential requisites for survival, such as a bowl to receive food once a day from the laity.
  • As they lived on alms, they were known as bhikkhus.

2. Women came to be admitted in sangha after the mediation of a disciple of Buddha, Ananda. The Buddha’s foster mother, Mahapajapati Gotami was the first woman to be ordained as a bhikkhuni. Many women who entered the sangha became teachers of dhamma and went on to become theris or respected women who had attained liberation.

Important Questions for Class 12 History

The post Important Questions for Class 12 History Chapter 4 Thinkers, Beliefs and Buildings (Cultural Developments) appeared first on Learn CBSE.


NIELIT CCC Online Course | Eligibility, Date, Registration

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NIELIT CCC Online Course: NIELIT CCC online course is a certified program that provides an opportunity for a common man to have knowledge about computers and information technology. CCC certification is a new course that helps in spreading digital literacy in the country. NIELIT CCC online course is available for everyone throughout the year.

NIELIT CCC Online Course Overview

Certification ProgramCCC certificate
Article categoryInformational
Conducting AuthorityNIELIT
CourseCourse on Computer Concepts (CCC)
Course Duration80 hours
ApplicationAvailable now (for April exam)
Mode of examOnline
Official Website of NIELIThttp://nielit.gov.in
NIELIT student portalstudent.nielit.gov.in

NIELIT CCC Exam

NIELIT which is the short name for the national institute of electronics and technology is an autonomous body that works under the government of India. The main task for NIELIT is to carry out human resource development activities. This is done in the field of electronics, information, and communication. The NIELIT body was formed in 1994 and was earlier known as DOEACC Society. It is run by the ministry of information technology and electronics of the government of India. There are various courses and programs related to IECT at various levels. In this, the CCC certification course is one that is being offered by the organization.

NIELIT CCC Exam Dates

Examination – Schedule for filling online application and fee paymentDate of examination
February – 1st November to 31st December1st Saturday of February
March – 1st to 31st January1st Saturday of March
April – 1st to 28/29 February1st Saturday of April
May – 1st to 31st March1st Saturday of May
June – 1st to 30th April1st Saturday of June
August – 1st May to 30th June1st Saturday of August
September – 1st to 31st July1st Saturday of September
October – 1st to 31st August1st Saturday of October
November – 1st to 30th September1st Saturday of November
December – 1st to 31st October1st Saturday of December

About CCC Online Certification

Course on computer concepts is a literacy program on computers and was recommended by the national task course on software development and information technology. CCC course is designed specifically to impart the basic IT literacy program for the common man. CCC is the program that the NIELIT offers under its several digital literacy programs. Through this course, the common man can access the computer and thereby enjoy the information technology world.

Currently, the total duration of the course is 80 hours and this includes 5 hours of tutorial, 25 hours of theory. Ideally, it can be said that the course can be of 2 intensive weeks.

CCC Exam Paper Pattern

  • Mode of the exam – Online exam
  • Type of question – Objective type
  • Paper – Only one paper
  • Total no of question – 100
  • Duration of the exam – 60 min
  • Negative marking – No
  • Total marks – 100
  • Qualifying marks – 50%

CCC Online Exam Syllabus

There are a total of 8 chapters included for the CCC course. These are elements of word processing, introduction to computer, introduction to the internet, introduction to the GUI based operating system, spreadsheets, communication and collaboration, WWW and web browsers, application of digital financial services, and applications of presentations.

NIELIT CCC Eligibility 2019

Like other exams, there is no maximum or minimum requirement for CCC online exam. Candidates can submit the CCC exam application form irrespective of their educational qualification and age. However, there are 3 modes through which candidates can be eligible for the CCC exam. These three criteria are as follows

  • Candidates that are sponsored by the NIELIT approved Institutes can join the program irrespective of their educational qualifications.
  • Applicants that ate sponsored by the government recognized schools or colleges and have obtained the unique Identity number from NIELIT for joining the CCC online program cab also conduct CCC program irrespective of their qualification.
  • Direct candidates that are not sponsored by the government recognized by the government school or college are also eligible irrespective of their educational qualifications.

NIELIT CCC Online Course Application Form

CCC online application forms are available on the NIELIT official portal. Candidates should be ready with all the essentials before filling the application for the CCC course. Some of the pre-requisites of this course are

  • Applicants should have a personal mobile number so that he or she can validate the application form. Also, he or she will receive all the intimations here on from NIELIT directly.
  • Applicants should also have a personal email ID and required for any future and validation purposes. E-mail ID is required for the entire certificate program.
  • Candidates are required to have a scanned passport-sized photograph, left thumb impression, and signature in the required format.

How To Fill the OEAF Application Form?

  1. Go to the official NIELIT portal for students.
  2. On the main website, there is an option for ‘Apply online’, click on this option.
  3. On this page, candidates will be required to select the CCC course among the different choices of courses given.
  4. Now, go through the instructions and guidelines of the course carefully and the given application fee. After this, candidates need to mark the fields stating they have accepted the declaration.
  5. The application form will be visible on the desktop screen where candidates are required to fill the personal details, qualification, contact number, examination details, and upload the required documents in the detail section.
  6. Once all the details are filled, candidates need to enter the security number that they have received on the mobile number and click on the ‘submit’ button.
  7. After the form is submitted, there is an option to preview the application form and mark the details that are incorrectly filled.
  8. If there are mistakes, click on the ‘submit’ button and you will receive the confirmation in the form of SMS and mail.
  9. Lastly, candidates will be required to pay the application fee and select the payment service option and make the due payment.

The application fee for the course and exam is Rs. 500 plus GST applicable.

The application fee for the CCC course is to be paid through online mode or SPV, CSC, or NEFT.

CCC Course Admit Card

Candidates need to download the admit card before the exam commences. Admit card will be given only through online mode and to the candidates that have successfully registered for the CCC course. Below are the steps to download the admit card for the candidates:

  • Go to the official student portal of NIELIT.
  • On the portal, there will be an option for downloading the admit card.
  • Select the course CCC which is available under the head IT program.
  • Enter the enrollment number and various other required credentials.
  • Admit card will be visible on the desktop and you can download it for any future purposes.

Candidates are requested to carry photo identity proofs like Aadhar card, PAN Card, driving license, voter ID, etc that is issued by the government or bank along with the admit card.

CCC 2019 Result

Usually, CCC certificate exam results are declared after 15 days of commencement of the exam. For this candidates check their results online at the NIELIT student portal. The results for CCC will be available in grades form and the system for this is as follows:

How To Download CCC Online Course Certificate?

The candidates that have appeared for the CCC online course can collect their CCC certificate through online mode only. Below are the important steps to download the CCC certificate online:

  1. Go to the official student portal of the NIELIT program.
  2. Firstly, you need to verify the data of the certificate.
  3. Candidates that have filled the required details can click on the ‘submit’ button.
  4. There will be a verification code sent on e-mail ID or SMS.
  5. This is required for verifying the signature digitally.
  6. Candidates can download the certificate through internet explorer or through Adobe Reader.

There is no fee charged to the candidates except for exam fees. There will no request for correction entertained by NIELIT. Only candidates that have filled the form offline are eligible for a correction request. Candidates are not required to submit their hard copies of the application form to the NIELIT office.

FAQ’s

Question 1.
Is it possible to submit more than 1 exam form during the single exam cycle?

Answer:
No, candidates cannot submit multiple forms during a single exam window cycle.

Question 2.
What to do in case of any mistake in the admit card?

Answer:
The details mentioned on the admit card is based on the information provided by the candidates in the application form. So, no request for correction in the admit card will be entertained by the office.

Question 3.
Is there any age limit required for the application of the CCC exam?

Answer:
No, there is no minimum or maximum age limit for CCC online course.

The post NIELIT CCC Online Course | Eligibility, Date, Registration appeared first on Learn CBSE.

Class 11 Geography Notes Chapter 4 Climate

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Class 11 Geography Notes Chapter 4 Climate

Weather is the momentary state of the atmosphere while climate refers to the average of the weather conditions over a longer period of time. Weather changes quickly, may be within a day or week but climate changes imperceptively and may be noted after 50 years or even more.

India has hot monsoonal climate which is the prevalent climate in south and south-east Asia.

While in the summer the mercury occasionally touches 55°C in the western Rajasthan, it drops down to as low as minus 45°C in winter around Leh. Churu in Rajasthan may record a temperature of 50°C or more on a June day while the mercury hardly touches 19°C in Tawang (Arunachal Pradesh) on the same day. On a December night, temperature in Drass (Jammu and Kashmir) may drop down to minus 45°C while Thiruvananthapuram or Chennai on the same night records 20°C or 22°C.

In Kerala and in the Andaman Islands, the difference between day and night temperatures may be hardly seven or eight degree Celsius. But in the Thar desert, if the day temperature is around 50°C, at night, it may drop down considerably upto 15°-20°C.

While snowfall occurs in the Himalayas, it only rains over the rest of the country. Similarly, variations are noticeable not only in the type of precipitation but also in its amount. While Cherrapunji and Mawsynram in the Khasi Hills of Meghalaya receive rainfall over 1,080 cm in a year, Jaisalmer in Rajasthan rarely gets more than 9 cm of rainfall during the same period.
Class 11 Geography Notes Chapter 4 Climate part b1
Tura situated in the Garo Hills of Meghalaya may receive an amount of rainfall in a single day which is equal to 10 years of rainfall at Jaisalmer. While the annual precipitation is less than 10 cm in the north-west Himalayas and the western deserts, it exceeds 400 cm in Meghalaya.

The Ganga delta and the coastal plains of Orissa are hit by strong rain-bearing storms almost every third or fifth day in July and August while the Coromandal coast, a thousand km to the south, goes generally dry during these months.

Most parts of the country get rainfall during June-September, but on the coastal areas of Tamil Nadu, it rains in the beginning of the winter season. In spite of these differences and variations, the climate of India is monsoonal in rhythm and character.

With a long coastline, large coastal areas have an equable climate. Areas in the interior of India are far away from the moderating influence of the sea. Such areas have extremes of climate.

Temperature decreases with height. Due to thin air, places in the mountains are cooler than places on the plains. With increase in height by 165 metres, temperature decreases by one degree celcius. Agra and Darjiling are located on the same latitude, but temperature of January in Agra is 16°C whereas it is only 4°C in Darjiling.

An easterly jet stream flows over the southern part of the Peninsula in June, and has a maximum speed of 90 km per hour. In August, it is confined to 15°N latitude, and in September up to 22°N latitudes. The easterlies normally do not extend to the north of 30°N latitude in the upper atmosphere.

The monsoon may burst in the first week of June in the coastal areas of Kerala, Karnataka, Goa and Maharashtra while in the interior parts of the country, it may be delayed to the first week of July. The day temperature registers a decline of 5°C to 8°C between mid- June and mid-July.

The mean daily temperature remains below 21°C over most parts of northern India. The night temperature may be quite low, sometimes going below freezing point in Punjab and Rajasthan.

The mean maximum temperature for January at Thiruvananthapuram is as high as 31°C, and for June, it is 29.5°C. Temperatures at the hills of Western Ghats remain comparatively low.

April, May and June are the months of summer in north India. In most parts of India, temperatures recorded are between 30°-32°C. In March, the highest day temperature of about 38°C occurs in the Deccan Plateau while in April, temperature ranging between 38°C and 43°C are found in Gujarat and Madhya Pradesh.

The average annual rainfall in India is about 125 cm, but it has great spatial variations.

The highest rainfall occurs along the west coast, on the Western Ghats, as well as in the Sub-Himalayan areas in the north-east and the hills of Meghalaya. Here the rainfall exceeds 200 cm. In some parts of Khasi and Jaintia hills, the rainfall exceeds 1,000 cm. In the Brahmaputra valley and the adjoining hills, the rainfall is less then 200 cm.

Rainfall between 100-200 cm is received in the southern parts of Gujarat, east Tamil Nadu, north-eastern Peninsula covering Odisha, Jharkhand, Bihar, eastern Madhya Pradesh, northern Ganga plain along the sub-Himalayas and the Cachar Valley and Manipur.

Areas of Low Rainfall: Western Uttar Pradesh, Delhi, Haryana, Punjab, Jammu and Kashmir, eastern Rajasthan, Gujarat and Deccan Plateau receive rainfall between 50-100 cm.

Areas of Inadequate Rainfall: Parts of the Peninsula, especially in Andhra Pradesh, Karnataka and Maharashtra, Ladakh and most of western Rajasthan receive rainfall below 50 cm. Snowfall is restricted to the Himalayan region.

The mean annual surface temperature of the earth in the past 150 years has increased. It is projected that by the year 2,100, global temperature will increase by about 2°C. This rise in temperature will cause many other changes: one of these is a rise in sea level, as a result of melting of glaciers and sea-ice due to warming.

Class 11 Geography Notes Chapter 4 Important Terms:

  • Monsoon: Monsoon connotes the climate associated with seasonal reversal in the direction of winds.
  • Weather: Weather is conditions of temperature, humidity, pressure, etc at a given point of time.
  • Climate: Climate is condition of temperature, humidity and pressure for a longer period of time.
  • Break in the monsoon: During the south-west monsoon period after having rains for a few days, if rain fails to occur for one or more weeks, it is known as break in the monsoon.
  • Dust storms: Dust storms in the evening are very common during May in Punjab, Haryana, Eastern Rajasthan and Uttar Pradesh.
  • Mango shower: Towards the end of summer, there are pre-monsoon showers which are a common phenomena in Kerala and coastal areas of Karnataka. Locally, they are known as mango showers since they help in the early ripening of
  • mangoes.
  • Blossom shower: With this shower, coffee flowers blossom in Kerala and nearby areas.
  • Nor westers: These are dreaded evening thunderstorms in Bengal and Assam. Their notorious nature can be understood from the local nomenclature of‘Kalbaisakhi’, a calamity of the month of Baisakh. These showers are useful for tea, jute and rice cultivation.
  • Breaks: The wet spells are interspersed with rainless interval known as ‘breaks’.
  • Climatic region: A climatic region has a homogeneous climatic condition which is the result of a combination of factors.
  • Disturbances: Inflow of western cyclones is generally known as disturbances during the winter season.
  • The Inter tropical convergence zone (ITCZ): It is a low pressure zone located at the equator where trade winds converge, and so, it is a zone where air tends to ascend.
  • Monsoon trough: In July, the ITCZ is located around 20°N-25°N latitudes over the Gangetic plain. These are sometimescalled the monsoon trough.
  • ITCZ: The inter tropical convergence Zone (ITCZ) is a low pressure zone located at the Equator where trade winds converge and so it is a zone where air trends to ascend. In July the ITCZ is located around 20°N-25° N latitudes (over the Gangetic Plain) sometimes called the monsoon trough.
  • Northeast monsoon: In winter, the ITCZ moves southward, and so the reversal of winds from northeast to south and southwest, takes place. They are called northeast monsoons.
  • Tropical depressions: Inflow of western cyclones is generally known as tropical depressions during the south-west monsoon period in India.
  • Bardoli chheerha: In Assam, Nor Westers storms are known as “Bardoli Chheerha”.
  • Loo: Hot, dry and oppressing winds blowing in the Northern plains from Punjab to Bihar with higher intensity between Delhi and Patna.
  • Bursting of the monsoon: High velocity winds with extreme thundering and lightening . cause sudden rainfall. It is
  • Jet stream: The winds blow across the Asian continent at latitudes north of the Himalayas roughly parallel to the Tibetan highlands are called jet stream.
  • Monsoon winds: Winds that bring rainfall are called monsoon winds.
  • Drought: It is a situation of scarce rainfall causing problem of usable water, failure of crops and sometimes famine like conditions.
  • Western cyclone: The western cyclonic disturbances enter the Indian subcontinent from the west and the north-west during the winter months. It originate over the Mediterranean Sea and are brought into India by the westerly jet stream.
  • Tropical cyclones: Tropical cyclones originate over the Bay of Bengal and the Indian Ocean. These tropical cyclones have very high wind velocity and heavy rainfall.
  • October-heat: Owing to the condition of high temperature and humidity, the weather becomes rather oppressive and this is known as the October-heat.

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 5 Natural Vegetation

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Class 11 Geography Notes Chapter 5 Natural Vegetation

On the basis of certain common features such as predominant vegetation type and climatic regions, Indian forests can be divided into the following groups:

  • Tro23ral and Swamp forests.

Tropical Evergreen forests are found in the western slope of the Western Ghats, hills of the north-eastern region and the Andaman and Nicobar Islands. They are found in warm and humid areas with an annual precipitation of over 200 cm and mean annual temperature above 22°C. In these forests, trees reach great heights up to 60 m or above. There is no definite time for trees to shed their leaves, flowering and fruition. As such these forests appear green all the year round. Species found in these forests include rosewood, mahogany, aini, ebony, etc.
Class 11 Geography Notes Chapter 5 Natural Vegetation part b1
The semi evergreen forests are found in the less rainy parts of these regions. Such forests have a mixture of evergreen and moist deciduous trees. The under growing climbers provide an evergreen character to these forests. Main species are white cedar, hollock and kail.

Tropical Deciduous Forests are the most widespread forests in India. They are also called the monsoon forests. They spread over regions which receive rainfall between 70-200 cm. On the basis of the availability of water, these forests are divided into two types: moist and dry deciduous.

The Moist deciduous forests are more pronounced in the regions which record rainfall between 100-200 cm. These forests are found in the north-eastern states along the foothills of Himalayas, eastern slopes of the Western Ghats and Odisha. Teak, sal, shisham, hurra, mahua, amla, semul, kusum, and sandalwood etc. are the main species of these forests.

Dry deciduous forest covers vast areas of the country, where rainfall ranges between 70-100 cm. On the wetter margins, it has a transition to the moist deciduous, while on the drier margins to thorn forests. These forests are found in rainier areas of the Peninsula and the plains of Uttar Pradesh and Bihar.

Tropical thorn forests occur in the areas which receive rainfall less than 50 cm. These consist of a variety of grasses and shrubs. It includes semi-arid areas of south west Punjab, Haryana, Rajasthan, Gujarat, Madhya Pradesh and Uttar Pradesh.

In mountainous areas, the decrease in temperature with increasing altitude leads to a corresponding change in natural vegetation. Mountain forests can be classified into two types, the northern mountain forests and the southern mountain forests.

The Himalayan ranges show a succession of vegetation from the tropical to the tundra, which change in with the altitude. Deciduous forests are found in the foothills of the Himalayas. It is succeeded by the wet temperate type of forests between an altitude of 1,000-2,000 m.

In the higher hill ranges of north-eastern India, hilly areas of West Bengal and Uttarakhand, evergreen broad leaf trees such as oak and chestnut are predominant. Between 1,500-1,750 m, pine forests are also well-developed in this zone, with Chir Pine as a very useful commercial tree.

Deodar, a highly valued endemic species grows mainly in the western part of the Himalayan range. Deodar is a durable wood mainly used in construction activity. Similarly, the chinar and the walnut, which sustain the famous Kashmir handicrafts, belong to this zone. Blue pine and spruce appear at altitudes of 2,225-3,048 m.

In India, the mangrove forests spread over 6,740 sq. km which is 7 per cent of the world’s mangrove forests. They are highly developed in the Andaman and Nicobar Islands and the Sunderbans of West Bengal. Other areas of significance are the Mahanadi, the Godavari and the Krishna deltas. These forests too, are being encroached upon, and hence, need conservation.

According to state records, the forest area covers 23.28 per cent of the total land area of the
country. It is important to note that the forest area and the actual forest cover are not the same.

Both forest area and forest cover vary from state to state. Lakshadweep has zero per cent approx forest area; Andaman and Nicobar Islands have 86.93 per cent. Some of the states with less than 10 per cent of the forest area lie in the north and north-western part of the country. These are Rajasthan, Gujarat, Punjab, Haryana and Delhi.

Geographical area under forests are:
Class 11 Geography Notes Chapter 5 Natural Vegetation part b2

The Government of India proposed to have a nation-wide forest conservation policy, and adopted a forest policy in 1952, which was further modified in 1988.

The National Commission on Agriculture (1976) has classified social forestry into three categories. These are urban forestry, rural forestry and farm forestry.

Urban forestry pertains to the raising and management of trees on public and privately owned lands in and around urban centres such as green belts, parks, roadside avenues, industrial and commercial green belts, etc.

Rural forestry lays emphasis on promotion of agro-forestry and community-forestry. Agro-forestry is the raising of trees and agriculture crops on the same land inclusive of the waste patches. It combines forestry with agriculture, thus, altering the simultaneous production of food, fodder, fuel, timber and fruits.

In 1972, a comprehensive Wildlife Act was enacted, which provides the main legal framework for conservation and protection of wildlife in India.

Now, there are 105 National parks and 514 wildlife sanctuaries covering an area of about 15.67 million hectares in the country.

Special schemes like Project Tiger and Project Elephant have been launched to conserve these species and their habitat in a sustainable manner. Project Elephant has been implemented since 1992.

Under Project Tiger, launched on 1 April 1973, 27 tiger reserves have been set up in 17 states covering an area of about 37,761 sq. km.

There are 18 Biosphere Reserves in India. Nine of them are recognized by UNESCO. They are :

  • Nilgiri
  • Nanda Devi
  • Sunderbans
  • Gulf of Mannar
  • Great Nicobar
  • Pachmarhi
  • Amarkantak
  • Norkek
  • Simlipal.

Out of a total of 593 districts, 188 have been identified as tribal districts. The tribal districts account for about 59.61 per cent of the total forest cover of the country whereas the geographical area of 188 tribal districts forms only 33.63 per cent of the total geographical area of the country.

Class 11 Geography Notes Chapter 5 Important Terms:

  • Natural vegetation: Natural vegetation refers to a plant community that has been left undisturbed over a long time, so as to allow its individual species to adjust themselves to climate and soil conditions as fully as possible.
  • Planted vegetation: It refers to planting of trees under human supervision.
  • International convention: An international convention is an agreement among member states of the United Nations.
  • Forest area: The forest area is the area notified and recorded as the forest land irrespective of the existence of trees. It is based on the records of the State Revenue Department.
  • Actual forest cover: The actual forest cover is the area occupied by forests with canopy. It is based on aerial photographs and satellite imageries.
  • Social forestry: Social forestry means the management and protection of forests and afforestation on barren lands with the purpose of helping in the environmental, social and rural development.
  • Community forestry: It involves the raising of trees on public or community land such as the village pasture and temple land, roadside, canal bank, strips along railway lines, and schools etc.
  • Rural forestry: It lays emphasis on promotion of agro-forestry and community-forestry. Agro-forestry is the raising of trees and agriculture crops on the same land inclusive of the waste patches.
  • Biosphere reserve: A Biosphere reserve is a unique and representative ecosystem of terrestrial and coastal areas which are internationally recognised within the framework of UNESCO’s Man and Biosphere (MAB) Programme.
  • National park: A national park is an area which is strictly reserved for the protection of the wildlife and where activities such as forestry, grazing or cultivation are not allowed.
  • Reserved forest: An area notified under the provisions of Indian Forest acts having full degree of protection. In protected forests, all activities are prohibited unless permitted.
  • Protected forest: An area notified under the provisions of Indian Forest Act or the State Forest Acts having limited degree of protection. In Protected Forests, all activities are permitted unless prohibited.
  • Sanctuary: A sanctuary is an area which is reserved for the conservation of animals only and operations such as harvesting of timber, collection of minor forest products are allowed so long as they do not affect the animals adversely.
  • Unclassed forest: An area recorded as forest but not included in reserved or protected forest category. Ownership status of such forests varies from state to state.
  • Conservation: The protection of natural environment and natural resources for the future is called conservation. It includes the management of minerals, landscape, soil and forests to prevent their destruction and over exploitation.

Class 11 Geography Notes

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Class 11 Geography Notes Chapter 6 Soils

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Class 11 Geography Notes Chapter 6 Soils

Soil is the mixture of rock debris and organic materials which develop on the earth’s surface.

The major factors affecting the formation of soil are relief, parent material, climate, vegetation and other life-forms and time. Besides these, human activities also influence it to a large extent.

Components of the soil are mineral particles, humus, water and air. The actual amount of each of these depends upon the type of soil.

Soil is bifurcated into three layers called horizons. ‘Horizon A’ is the topmost zone, where organic materials have got incorporated with the mineral matter, nutrients and water, which are necessary for the growth of plants. ‘Horizon B’ is a transition zone between the ‘horizon A’ and ‘horizon C’, and contains matter derived from below as well as from above. It has some organic matter in it, although the mineral matter is noticeably weathered. ‘Horizon C’ is composed of the loose parent material. This layer is the first stage in the soil formation process and eventually forms the above two layers.

In ancient times, soils used to be classified into twro main groups – Urvara and Usara, which were fertile and sterile, respectively.

In the 16th century A.D., soils were classified on the basis of their inherent characteristics and external features such as texture, colour, slope of land and moisture content in the soil. Based on texture, main soil types were identified as sandy, clayey, silty and loamy, etc. On the basis of colour, they wrere red, yellow, black, etc.

On the basis of genesis, colour, composition and location, the soils of India have been classified into:

  • Alluvial soils
  • Black soils
  • Red and Yellow soils
  • Laterite soils
  • Arid soils
  • Saline soils
  • Peaty soils
  • Forest soils.

Alluvial Soils Alluvial soils are widespread in the northern plains and the river valleys. These soils cover about 40 per cent of the total area of the country. They are depositional soils, transported and deposited by rivers and streams.

The alluvial soils vary in nature from sandy loam to clay. They are generally rich in potash but poor in phosphorous. In the Upper and Middle Ganga plain, two different types of alluvial soils have developed, viz. Khadar and Bhangar.

Khadar is the new alluvium and is deposited by floods annually, which enriches the soil by depositing fine silts. Bhangar represents a system of older alluvium, deposited away from the flood plains.

Black soil covers most of the Deccan Plateau which includes parts of Maharashtra, Madhya Pradesh, Gujarat, .Andhra Pradesh and some parts of Tamil Nadu. In the upper reaches of the Godavari and the Krishna, and the north western part of the Deccan Plateau, the black soil is very deep.

Red soil develops on crystalline igneous rocks in areas of low rainfall in the eastern and southern part of the Deccan Plateau. Along the piedmont zone of the Western Ghat, long stretch of area is occupied by red loamy soil.

Laterite has been derived from the Latin word ‘Later’ which means brick. The laterite soils develop in areas with high temperature and high rainfall. These are the result of intense leaching due to tropical rains. With rain, lime and silica are leached away, and soils rich in iron oxide and aluminium compound are left behind.

Arid soils range from red to brown in colour. They are generally sandy in structure and saline in nature. In some areas, the salt content is so high that common salt is obtained by evaporating the saline water. Due to the dry climate, high temperature and accelerated evaporation, they lack moisture and humus.

Saline soils are also known as Usara soils. Saline soils contain a larger proportion of sodium, potassium and magnesium, and thus, they are infertile, and do not support any vegetative growth. They have more salts, largely because of dry climate and poor drainage. They occur in arid and semi-arid regions, and in waterlogged and swampy areas.

Peaty soils are found in the areas of heavy rainfall and high humidity, where there is a good growth of vegetation. Thus, large quantity of dead organic matter accumulates in these areas, and this gives a rich humus and organic content to the soil. Organic matter in these soils may go even up to 40-50 per cent.

Forest soils are formed in the forest areas where sufficient rainfall is available. The soils vary in structure and texture depending on the mountain environment where they are formed. They are loamy and silty on valley sides and coarse-grained in the upper slopes.

Soil degradation can be defined as the decline in soil fertility, when the nutritional status declines and depth of the soil goes down due to erosion and misuse. Soil degradation is the main factor leading to the depleting soil resource base in India. The degree of soil degradation varies from place to place according to the topography, wind velocity and amount of the rainfall.

The destruction of the soil cover is described as soil erosion. Forest and other natural vegetation are removed for human settlement, for cultivation, for grazing animals and for various other needs. Wind and water are powerful agents of soil erosion because of their ability to remove soil and transport it.

Soil erosion is a serious problem for Indian agriculture and its negative eff ects are seen in other spheres also. Eroded materials are carried down to rivers and they lower down their carrying capacity, and cause frequent floods and damage to agricultural lands.

Deforestation is one of the major causes of soil erosion. Plants keep soils bound in locks of roots, and thus, prevent erosion. They also add humus to the soil by shedding leaves and twigs. The salt lodged in the lower profiles of the soil comes up to the surface and destroys its fertility. Chemical fertilizers in the absence of organic manures are also harmful to the soil.

If soil erosion and exhaustion are caused by humans; by corollary, they can also be prevented by humans. Contour bunding, Contour terracing, regulated forestry, controlled grazing, cover cropping, mixed farming and crop rotation are some of the remedial measures which are often adopted to reduce soil erosion.

Experiments have been made to stabilize sand dunes in western Rajasthan by the Central Arid Zone Research Institute (CAZRI). The Central Soil Conservation Board, set up by the Government of India, has prepared a number of plans for soil conservation in different parts of the country.

Important Soils Found In India:
Class 11 Geography Notes Chapter 6 Soils partb1
Class 11 Geography Notes Chapter 6 Soils partb2
Class 11 Geography Notes Chapter 6 Soils partb3
Class 11 Geography Notes Chapter 6 Soils partb4

Class 11 Geography Notes Chapter 6 Important Terms:

  • Soil: Soil is the mixture of rock debris and organic materials which develop on the earth’s surface.
  • Bad land topography: A region with a large number of deep gullies or ravines is called a bad land topography.
  • Horizons: When we dig a pit on land and look at the soil, we find that it consists of three layers. These are called horizons.
  • Horizon A: It is the topmost zone, where organic materials have got incorporated with the • mineral matter, nutrients and water, which are necessary for the growth of plants.
  • Horizon B: It is a transition zone between the ‘horizon A’ and ‘horizon C’, and contains matter derived from below as well as from above. It has some organic matter in it, although the mineral matter is noticeably weathered.
  • Horizon C: It is composed of the loose parent material. This layer is the first stage in the soil formation process and eventually forms the above two layers.
  • Soil profile: The arrangement of layers in three horizons, A, B and C is known as the soil profile.
  • Parent rock: Underneath the three horizons there is the rock which is known as the parent rock or the bedrock.
  • Estuary: The tidal mouth of a river where fresh and saline water get mixed.
  • Gully erosion: It is the erosion of the soil and rock by the concentration of runoff into gullies.
  • Humus: The dead organic content of the soil.
  • Khadar: Khadar is the new alluvium and is deposited by floods annually, which enriches the soil by depositing fine silts.
  • Bhangar: Bhangar represents a system of older alluvium, deposited away from the flood plains.
  • Alluvial soil: They are depositional soils, transported and deposited by rivers and streams.
  • Laterite soil: Laterite has been derived from the Latin word ‘Later’ which means brick. The laterite soils develop in areas with high temperature and high rainfall.
  • Black soil: These soils are made from volcanoes. These soils are also known as the ‘RegurSoil’ or the ‘Black Cotton Soil’.
  • Forest soils: Forest soils are formed in the forest areas where sufficient rainfall is available.
  • Peaty soils: They are found in the areas of heavy rainfall and high humidity, where there is a good growth of vegetation.
  • Soil erosion: The destruction of the soil cover is described as soil erosion.
  • Soil degradation: Soil degradation can be defined as the decline in soil fertility, when the nutritional status declines and depth of the soil goes down due to erosion and misuse. Soil degradation is the main factor leading to the depleting soil resource base in India.
  • Soil Conservation: Soil conservation is a methodology to maintain soil fertility, prevent soil erosion and exhaustion, and improve the degraded condition of the soil.

Class 11 Geography Notes

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HSCAP Kerala Plus One 3rd Allotment Result 2019 | DHSE +1 Allotment Result

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HSCAP Kerala Plus One 3rd Allotment Result 2019: HSCAP Kerala plus one 3rd allotment result 2019 has been announced on 15th June 2019. The application process for DHSE, Kerala plus one for the academic session has been completed on April 16, 2019. Also, the verification process for the applications is about to be complete. All the candidates that have not been allotted any colleges are looking for the release of 3rd allotment. Thus they can have an idea about the actual seat allotment result and other ideas.

Latest Update: Kerala Plus One 1st Supplementary Allotment Results announced today on 15th June 2019.

Click Here to Check HSCAP +1 3rd Allotment Result 2019

HSCAP Kerala Plus One 3rd Allotment Result 2019

The 3rd allotment for Kerala plus one exam will be released soon. Candidates can access the same from the HSCAP portal. The 3rd allotment for Kerala plus one exam will be followed by 2nd seat allotment on May 31. All the candidates are thus suggested to watch out for the same on official HSCAP, DHSE website. DHSE (The directorate of higher secondary education) is the authority for the Kerala government that is responsible for catering the admission of candidates to plus one and various other government/government-aided higher secondary schools in Kerala.

The admission for the candidates that are suitable for plus one or class XI in DHSE affiliated schools is being carried out through single window admission.

HSCAP Kerala Plus One 3rd Allotment Result 2019 Important Dates

ActivitiesDates
Release of notification for application10th May 2019
Last date of application16th May 2019
Display of trial seat allotment result20th May 2019
Display of 1st seat allotment result24th May 2019
Display of 2nd seat allotment result31st May 2019
3rd Seat Allotment Resultreleased
Commencement of plus one classes3rd June 2019
Last date for plus one admission5th July 2019

HSCAP Kerala Plus One 3rd Allotment Result

As the name says, the 3rd allotment of seat is a procedure of allocating the seats to candidates in order to fill up the rest of seats after 2nd allotment round. This is generally conducted to provide the idea to the candidates about the chances of getting a seat for the course or class and college on the basis of options left and candidate’s merit. The process of seat allotment will be done only through online mode. The result for seat allotment will be uploaded on the HSCAP official website. Candidates whose applications are verified can access the official website by just using their enrollment number and other relevant details. They should also note that the seat allotment during any stage will not be done in the physical form for the candidates

Soon the candidates will be able to see the HSCAP, Kerala plus applicants online. Admission authority is not going to communicate the result for 3rd allotment through any post. Also, no hard copy will be issued for the allotment of a seat at any stage. Thus, the candidates are advised to access the portal through online mode only.

How To Check HSCAP Kerala Plus One 3rd Allotment Result 2019?

The candidates that have submitted their plus one applications can check the result online by following the instructions given below:

  1. Go to the HSCAP official website which is hscap.kerala.gov.in.
  2. On the homepage candidates will find a link for 3rd allotment seat result 2019.
  3. After clicking on the link, candidates will be asked to enter the relevant details. These details include the candidate’s application number and date of birth.
  4. Once all the details are filled click on the ‘submit’ button given below.
  5. After the login details are verified and entered successfully, 3rd allotment result will appear on the desktop. Here, candidates can check all the details related to plus one 3rd final seat allotment.
  6. Once all the details are checked candidates can download the seat allotment given online.

HSCAP – Activities After 3rd Seat Allotment

Once the process for 3rd seat allotment is over, candidates are given a chance to make the changes in the choices that are submitted by them during the application process. The candidates that have not been allotted any seat in the third allotment will have to wait for the 4th seT allotment process. Candidates that will be allotted the seats need to report the allotted school at the specific schedule along with all the required documents and complete the admission formalities.

FAQ’s

Question 1.
When will Kerala plus one 3rd allotment results made available?

Answer:
Kerala plus one 3rd allotment result 2019 has been announced on June 15, 2019, through online mode.

Question 2.
Which is the conducting body for Kerala plus one 3rd allotment result 2019?

Answer:
The conducting body for Kerala plus one 3rd allotment result 2019 is directorate of higher secondary education, Kerala.

Question 3.
What is the official website for Kerala plus one 3rd allotment result 2019?

Answer:
The official website for Kerala plus one 3rd allotment result 2019 is hscap.kerala.gov.in.

The post HSCAP Kerala Plus One 3rd Allotment Result 2019 | DHSE +1 Allotment Result appeared first on Learn CBSE.

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