Life Processes in Plants Class 7 Extra Questions and Answers Science Chapter 10

Students can keep Class 7 Science Extra Questions and Class 7th Curiosity Chapter 10 Life Processes in Plants Important Extra Question Answer handy for quick reference during exams.

Class 7 Science Chapter 10 Life Processes in Plants Extra Questions

Class 7 Science Chapter 10 Extra Questions on Life Processes in Plants

Life Processes in Plants Class 7 Very Short Question Answer

Question 1.
What are nutrients?
Answer:
The components of food that are necessary for our body are called nutrients.

Question 2.
What are stomata?
Answer:
Tiny pores present on the lower surface of the leaves that helps in exchange of gases are called stomata.

Question 3.
Whether food is made in all parts of a plant or only in certain parts?
Answer:
The food is made mainly in leaves and some other parts of the plants that contain chlorophyll.

Question 4.
What are the food factories of plants?
Answer:
Leaves are the food factories of plants.

Question 5.
Name the process by which plants prepare their own food.
Answer:
Photosynthesis

Question 6.
Name the pigment that makes leaves green.
Answer:
Chlorophyll

Question 7.
What is the function of chlorophyll?
Answer:
Chlorophyll captures the energy of sunlight.

Question 8.
What are the end products of photosynthesis?
Answer:
Glucose and oxygen

Question 9.
Name the gas used in photosynthesis.
Answer:
Carbon dioxide

Question 10.
Name the gas released in photosynthesis.
Answer:
Oxygen

Question 11.
Name the chemical which is used to test the presence of starch in the leaf.
Answer:
Iodine solution

Question 12.
Photosynthesis requires chlorophyll and a few other raw materials. Add the missing raw materials to the list given below:
Water, minerals,
Answer:
(a) Sunlight/light energy,
(b) Carbon dioxide

Life Processes in Plants Class 7 Short Question Answer

Question 1.
A goat eats away all the leaves of a small plant (balsam). However, in a few days, new leaves could be seen sprouting in the plant again. How did the plant survive without leaves?
Answer:
During the process of photosynthesis, the plant takes water, carbon dioxide, and essential nutrients from the surroundings, converts them to energy or carbohydrates, and stores them. The plant managed to survive in the absence of leaves due to the energy stored in the plant in the form of starch.

Question 2.
Sunlight, chlorophyll, carbon dioxide, water, and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials.
(a) Available in the plant : ______
(b) Available in the soil : ______
(c) Available in the air : ______
(d) Available during day : ______
Answer:
(a) Chlorophyll
(b) Water, minerals
(c) Carbon dioxide
(d) Sunlight

Question 3.
How would you test the presence of starch in leaves?
Answer:
To test the presence of starch in leaves, following steps is followed:

1. Keep the leaf in boiling water for 5 minutes to soften it.
2. Dip this leaf in a test tube containing alcohol to remove the chlorophyll,
3. Place the test tube in a beaker with boiling water.
4. Wait for the leaf to become colourless,
5. Take out the leaf and place it on a plate,
6. Finally, add a few drops of iodine solution to the leaf. Wait for few minutes and observe.
7. If the leaf turns blue-black, it indicates the presence of starch.

Question 4.
How do plants obtain the raw materials for photosynthesis from the surroundings?
Answer:
Plants obtain the raw materials for photosynthesis from their surroundings in different ways. They absorb water through their roots from the soil, take in carbon dioxide from the air through stomata, and capture sunlight using the chlorophyll in their leaves.

Question 5.
Give a brief description of the process of synthesis of food in green plants.
Answer:
Green plants make their food using sunlight, carbon dioxide, and water. The chlorophyll in the leaves absorbs sunlight, while the plant takes in carbon dioxide from the air through small openings called stomata and water from the soil through the roots. Using sunlight’s energy, the plant combines carbon dioxide and water to produce glucose (food) and release oxygen as a by-product.

Question 6.
How do plants transport raw materials to the food factories of the plants?
Answer:
Plants transport raw materials to the leaves through different methods. Water is absorbed by the roots and carried to the leaves viaxylem vessels, while carbon dioxide enters the leaves through stomata. Nutrients from the soil are also transported with water. These materials are used by the leaves to make food through photosynthesis. The food prepared in the leaves are transported to other parts of the plant through another set of thin tube-like structure called the phloem.

Life Processes in Plants Class 7 Long Question Answer

Question 1.
What is photosynthesis? Explain the process of photosynthesis in the plants.
Answer:
The green plants can prepare their own food. The process by which green plants make their own food is called photosynthesis (Photo = light, synthesis = to make). Every green part of the plant can prepare food but leaves are the most prominent.

The green leaves are called ‘food factories’ of the plant. If stem is green, it can also carry out photosynthesis. Green parts of a plant have green pigment in them known as chlorophyll. Chlorophyll pigment traps light energy from the sun and uses it in making food. Plants receive light energy from the sun, carbon dioxide from the atmosphere and water from the soil. As a result of photosynthesis, plants synthesise glucose and give out oxygen. Thus, the green plants convert these raw materials into food with the help of light energy.

Question 2.
Fill in the blanks of the paragraph given below with the words provided in the box.
chlorophyll, energy, food, carbon, dioxide, water, photosynthesis

Note: A word can be used more than once.
Leaves have a green pigment called _______ which captures _______ from sunlight. This energy is used in the process of _______ and, along with other raw materials like _______ and _______ synthesises _______.
Answer:
Leaves have a green pigment called chlorophyll, which captures energy from sunlight. This energy is used in the process of photosynthesis and, along with other raw materials like carbon dioxide and water, synthesises food.

Question 3.
What is the role of stomata in both photosynthesis and respiration?
Answer:
Stomata are tiny pores present on the lower surface of leaves. During photosynthesis, stomata allow carbon dioxide to enter the leaves. During respiration, they help in the exchange of gases oxygen comes in, and carbon dioxide goes out. Stomata are very important because they help the plant breathe and make food. Without them, the plant would not be able to take in the gases needed for life processes.

Life Processes in Plants Class 7 Skill-Based Questions

Question 1.
Answer the following:
(i) Draw a schematic diagram showing photosynthesis.
Answer:
A schematic diagram showing photosynthesis is as following:

(ii) What are the products of photosynthesis?
Answer:
The products of photosynthesis are glucose and oxygen.

(iii) Name the gases utilised and liberated in photosynthesis.
Answer:
The oxygen is liberated, and carbon dioxide is utilised in photosynthesis.

(iv) Can all plants do photosynthesis?
Answer:
All plants cannot do photosynthesis, only green plants, which contain chlorophyll pigment, can do photosynthesis.

Question 2.
Complete the equations and name the processes:

(iii) Differentiate between the two processes,
Answer:

(iii) Photosynthesis is the process by which green plants make food using sunlight, carbon dioxide, and water. It happens in the leaves during the day and gives out oxygen. Respiration is the process by which plants use oxygen to break down food and release energy. It happens in all parts of the plant, both day and night, and gives out carbon dioxide.

Life Processes in Plants Class 7 Case-Based Questions

1. Oxygen which is essential for the survival of all organisms is produced during photosynthesis. In the absence of photosynthesis, life would be impossible on the earth. During photosynthesis, chlorophyll containing cells of leaves, in the presence of sunlight, use carbon dioxide and water to synthesise carbohydrates. During the process oxygen is released. The presence of starch in leaves indicates the occurrence of photosynthesis. Starch is also a carbohydrate.

(i) Which component is essential for the survival of all the living organisms?
(a) Oxygen
(b) Carbon dioxide
(c) Carbon Monoxide
(d) Hydrogen
Answer:
(a) Oxygen

(ii) Name the green pigment present in leaves.
Answer:
Chlorophyll

(iii) How we come to know the occurrence of photosynthesis in a plant?
Answer:
The presence of reserve food material (i.e. starch) in the leaves of plant indicates the occurrence of photosynthesis OR
Chlorophyll
OR
Write the word equation of photosynthesis.
Answer:

Life Processes in Plants Class 7 Suggested Projects and Activities

1. Create a “Mini Plant World in a Jar” by planting a small indoor plant like a money plant or baby fern in a transparent glass jar with some soil, pebbles, and a little water. Keep it open for a few days, then seal the jar and place it in the sunlight. If the plant keeps growing, it means it is reusing the gases it produces carbon dioxide for making food and oxygen for breathing. This shows that the plant is carrying out both photosynthesis and respiration inside the closed jar.

Life Processes in Plants Extra Questions for Practice

Question 1.
A leaf shows no colour change when iodine is added. What does this mean?
(a) Leaf has too much starch.
(b) Leaf has no chlorophyll.
(c) Starch is present.
(d) Starch is not present.

Question 2.
Which gas is essential for photosynthesis in plants?
(a) Oxygen
(b) Nitrogen
(c) Carbon dioxide
(d) Hydrogen

Question 3.
During respiration, glucose is broken down in the presence of ______.
(a) Carbon dioxide
(b) Oxygen
(c) Hydrogen
(d) Nitrogen

Question 4.
Read the given statements and select the correct option.
Assertion (A): Sunlight, water, carbon dioxide and chlorophyll are necessary photosynthesis.
Reason (R): During photosynthesis, plants produce food in the form of starch.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Question 5.
Match the items in column I with those in column II.

(a) (i)-(q), (ii)-(s), (iii)-(t), (iv)-(r), (v)-(p)
(b) (i)-(s), (ii)-(p), (iii)-(t), (iv)-(r), (v)-(q)
(c) (i)-(q), (ii)-(p), (iii)-(s), (iv)-(t), (v)-(r)
(d) (i)-(s), (ii)-(p), (iii)-(q), (iv)-(r), (v)-(t)

Question 6.
Write the word equation of photosynthesis.

Question 7.
What are the important components required for the production of glucose in plants?

Question 8.
In what form is glucose stored in plants?

Question 9.
Do all parts of the plant carry out respiration?

Question 10.
Do plants also respire like human beings?

Question 11.
What is photosynthesis?

Question 12.
What is the role of stomata?

Question 13.
What is the role of chlorophyll?

Question 14.
Why alcohol should never be placed near a heat source directly?

Question 15.
Define xylem and phloem.

Question 16.
How is food produced by leaves transported to other parts of the plant?

Question 17.
Explain the difference between xylem and phloem.

Question 18.
How do leaves exchange gases during the process of photosynthesis?

Question 19.
Why is chlorophyll important for the production of starch in plants?

Question 20.
What will happen if the plant is kept in the dark?

Question 21.
What is respiration in plants? How is it different from photosynthesis? Explain the importance of both processes.

Question 22.
Describe the process of photosynthesis. What is the role of chlorophyll, water, carbon dioxide, and sunlight in this process?

Question 23.
With the help of an experiment, explain that carbon dioxide is released during respiration.

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