Life Processes in Animals Class 7 Extra Questions and Answers Science Chapter 9

Students can keep Class 7 Science Extra Questions and Class 7th Curiosity Chapter 9 Life Processes in Animals Important Extra Question Answer handy for quick reference during exams.

Class 7 Science Chapter 9 Life Processes in Animals Extra Questions

Class 7 Science Chapter 9 Extra Questions on Life Processes in Animals

Life Processes in Animals Class 7 Very Short Question Answer

Question 1.
Given below from (i) to (iv) are some food items.
(i) Boiled and mashed potato
(ii) Glucose solution
(iii) A slice of bread
(iv) Mustard oil

Which of the above will give a blue-black colour when tested with iodine?
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (iii) and (iv)
Answer:
(b) (i) and (iii)

Question 2.
During inhalation, the diaphragm:
(a) Relaxes and moves up
(b) Contracts and moves down
(c) Reduce space in the lungs
(d) Closes the windpipe
Answer:
(b) Contracts and moves down

Question 3.
Which of the following is NOT part of the digestive system?
(a) Oesophagus
(b) Pancreas
(c) Kidney
(d) Stomach
Answer:
(c) Kidney

Question 4.
The small balloon-like sacs in the lungs where gas exchange occurs are called:
(a) Bronchi
(b) Alveoli
(c) Windpipe
(d) Nasal passage
Answer:
(b) Alveoli

Question 5.
What is the main function of the lungs in the respiratory system?
(a) Pump blood
(b) Absorb nutrients
(c) Exchange gases
(d) Digest food
Answer:
(c) Exchange gases

Question 6.
Breathing is a process that
(i) provides O₂ to the body.
(ii) breaks down food to release energy.
(iii) helps the body to get rid of CO₂.
(iv) produces water in the cells.
Which of the following gives the correct combination of functions of breathing?
(a) (i) and (ii)
(b) (ii) and (in)
(c) (i) and (in)
(d) (ii) and (in)
Answer:
(c) (i) and (in)

Question 7.
The swallowed food moves downwards in the alimentary canal because of
(a) force provided by the muscular tongue
(b) the flow of water taken with the food
(c) gravitational pull
(d) the contraction of muscles in the wall of the food pipe.
Answer:
(d) the contraction of muscles in the wall of the food pipe.

Question 8.
The finger-like outgrowths of Amoeba help to ingest food. However, the finger-like outgrowths of the human intestine help to
(a) digest the fatty food substances
(b) make the food soluble
(c) absorb the digested food
(d) absorb the undigested food.
Answer:
(c) absorb the digested food

Question 9.
What is the role of saliva in digestion?
(a) It digests proteins.
(b) It breaks down fats.
(c) It moistens food and begins starch digestion.
(d) It neutralises stomach acid.
Answer:
(c) It moistens food and begins starch digestion.

Question 10.
During the process of exhalation, the ribs move
(a) down and inwards.
(b) up and inwards.
(c) down and outwards.
(d) up and outward.
Answer:
(a) down and inwards.

Question 11.
The main purpose of respiration is to:
(a) Produce oxygen
(b) Eliminate waste
(c) Produce energy
(d) Digest food.
Answer:
(c) Produce energy

Life Processes in Animals Class 7 Very Short Question Answer

Question 1.
Name the process by which energy is obtained by a living organism.
Answer:
Respiration.

Question 2.
What is the percentage of exhaled carbon dioxide during the breathing mechanism?
Answer:
Nearly 4-5%.

Question 3.
What is the length of the small intestine?
Answer:
About 6 meters.

Question 4.
Define the term egestion.
Answer:
The process of removal of faecal matter through the anus from time to time is called egestion.

Question 5.
What are ruminants?
Answer:
The animals in which partially digested food returns to the mouth and the animal chews it are called ruminants.

Question 6.
What is the role of the pancreas?
Answer:
The pancreas secrets pancreatic juice which is important for digestion process.

Question 7.
Which chemical would you select to test the presence of starch in the food item?
Answer:
Iodine solution

Question 8.
Name the organ that constitutes respiration in fish.
Answer:
Gills.

Question 9.
Where is water absorbed in the digestive system?
Answer:
Water is absorbed in the large intestine.

Life Processes in Animals Class 7 Short Question Answer

Question 1.
Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food. Can you give the reason?
Answer:
Ruminants quickly swallow the food and store it in an isolated part of the stomach called the rumen, where the food gets partially digested and is called cud, which later on returns to the mouth in the form of small lumps and then is chewed up by the animal. This process is called rumination.

Question 2.
Explain the process of breathing.
Answer:
The process of breathing happens in two steps inhalation (breathing in) and exhalation (breathing out).
(i) When we inhale air, the diaphragm moves downwards and the chest cavity expands. This makes space for the lungs to fill with air. Air rushes in and fills the tiny air sacs in the lungs called alveoli.

(ii) When we exhale, the diaphragm moves upwards and the chest cavity becomes smaller. This pushes out the air containing carbon dioxide and water vapour from the lungs.

Question 3.
Explain digestion in the mouth.
Answer:
In the mouth, the food is grind with the help of teeth. The saliva in the mouth breaks down starch into sugar.

Question 4.
Explain the process of digestion in the small intestine.
Answer:
The small intestine is a long, coiled tube (6 metres) where most of the digestion and absorption of food happens. Digestive juices from the liver (bile) and the pancreas (pancreatic juice) are mixed with the food in the small intestine. These juices help to break down fats, proteins, and carbohydrates into simpler forms. After digestion, the tiny finger¬like structures on the inner walls of the small intestine absorb the nutrients into the blood.

Question 5.
Draw a diagram of the oesophagus and stomach to show the movement of food.
Answer:

Fig. Movement of food

Question 6.
Explain the digestive system of a bird with the help of a diagram.
Answer:

Fig. Digestive system in birds

Question 7.
What do you understand by passive smoking?
Answer:
Passive smoking, also known as second¬hand smoking, happens when a non-smoker breathes in the smoke from someone else’s cigarette, cigar, or pipe. This smoke contains harmful chemicals, just like the smoke inhaled by the smoker.

Question 8.
Pick the odd-one-out from each of the groups given below on the basis of respiratory organs. Give reason for your answer.
(a) cockroach, grasshopper, snail, ant
(b) lizard, cow, earthworm, snake
(c) crocodile, whale, dolphin, fish
(d) snake, tadpole, crow, goat
Answer:
(a) Snail, as it does not breathe through trachea.
(b) Earthworm, because unlike others earthworm breathes through its skin and does not have lungs.
(c) Fish, because unlike others most fishes breathe through their gills and do not have lungs.
(d) Tadpole, because unlike others tadpole breathes through gills and does not have lungs.

Life Processes in Animals Class 7 Long Question Answer

Question 1.
Describe the different parts of the digestive system.
Answer:
The different parts of the digestive system are as follows:

1. Digestion starts in the mouth, where teeth chew the food and saliva changes starch into sugar.
2. The food moves through the oesophagus to the stomach.
3. In the stomach, food is mixed and churned. Digestive juices break down proteins, acid kills germs, and mucus protects the stomach.
4. The food then goes to the small intestine, where juices from the liver, pancreas, and the intestine digest fats, proteins, and carbohydrates.
5. The inner lining of the small intestine has finger-like projections that absorbs the digested nutrients into the blood.
6. The leftover food moves to the large intestine, where water and salts are absorbed.
7. The solid waste (stool) is stored in the rectum and passed out through the anus. This process is called egestion.

Question 2.
Label the following parts and name them

(a) Secretes bile that breaks down fats and neutralises acids.
(b) Breaks down proteins using digestive juice, acid, and mucus.
(c) Secretes pancreatic juice that digests carbohydrates, proteins, and fats.
(d) Absorbs water and salts; stores stool before egestion.
(e) Receives digestive juices and absorbs nutrients through finger-like projections.
Answer:

Fig. Human digestive system

(a) Liver
(b) Stomach
(c) Pancreas
(d) Large intestine
(e) Small intestine

Question 3.
Give the pathway of air in the human respiratory system.
Answer:
The pathway of air in the human respiratoiy system is given as:

Question 4.
Explain the mechanism of breathing with the help of a diagram.
Answer:
Breathing means taking in air (inhalation) and letting it out (exhalation). We breathe to get oxygen and remove carbon dioxide. Air enters through the nostrils, passes through the nasal passages, and goes into the windpipe. The windpipe splits into two branches, one for each lung. Inside the lungs, these divide into smaller tubes ending in alveoli, where gases are exchanged.

When we inhale, the ribs move up and out, and the diaphragm moves down. This increases space in the chest, and air enters the lungs. When we exhale, the ribs move down and in, and the diaphragm moves up. This pushes air out of the lungs.

Fig. (a) Inhalation (b) Exhalation

Life Processes in Animals Class 7 Skill-based Questions

Question 1.
Refer to the diagram of the human digestive system and answer the following Question:
(a) Label the parts marked as 1, 2, 3 and 4.
(b) Name the longest part of alimentary canal.

Answer:
(a) (1) Mouth 2. Liver 3. Pancreas 4. Anus,
(b) Small intestine.

Question 2.
(a) Refer to the diagram of the digestive system and label the parts marked as 1 and 2.

(b) Name the process by which food is digested.
Answer:
(a) 1. Rumen 2. Pancreas
(b) Rumination

Question 3.
Draw a diagram of the breathing parts in a fish.
Answer:

Life Processes in Animals Class 7 Case-Based Questions

1. Rahul noticed that when he chewed a piece of bread for a long time, it started tasting sweet. His teacher explained that it happens because enzymes in saliva start breaking down starch into sugar.
(i). Name the type of nutrient present in the bread.
Answer:
Bread contains a nutrient called starch.

(ii) What did Rahul notice after chewing bread for a while?
Answer:
Rahul noticed that the bread started tasting sweet after he chewed it for a long time.

(iii) What helps in the breaking down of starch in the mouth?
Answer:
The saliva helps in the breaking down of starch in the mouth.
OR
What is starch changed into when we chew bread for a long time?
Answer:
Starch is changed into simple sugars when we chew bread for a long time.

2. In a health awareness seminar, students learned that smoking affects the lungs by damaging the alveoli and reducing their surface area. This makes breathing difficult and reduces the amount of oxygen absorbed into the blood.
(i) Which part of the lungs gets damaged by smoking?
Answer:
Smoking damages the alveoli in the lungs.

(ii) What happens when the alveoli are damaged?
Answer:
When the alveoli are damaged, their surface area gets reduced, making breathing difficult and lowering the amount of oxygen absorbed into the blood.

(iii) Why is smoking dangerous for health?
Answer:
Smoking is dangerous for health as it can lead to serious diseases such as lung cancer, heart disease, and respiratory problems, and can also harm others through passive smoking. It is considered a major cause of preventable death worldwide.
OR
Why is it a risk for non-smokers when they inhale polluted air?
Answer:
When non-smokers breathe in polluted air (smoke from cigarettes, vehicle emissions, dust, and toxic gases), they are exposed to the same harmful chemicals as smokers. This can lead to serious health problems such as asthma, respiratory infections, heart disease, and even lung cancer. Therefore, breathing polluted air is dangerous for everyone, not just smokers

Life Processes in Animals Class 7 Suggested Projects and Activities

1. Make posters and speeches to educate peers on the harmful effects of smoking on the respiratory system.

2. Journey of chapati: Students can take on the roles of different parts of the digestive system, such as the mouth, oesophagus, stomach, liver, pancreas, small intestine, and large intestine. As the “chapati’ begins its journey through the body, each student can explain their function and what happens to the food at their stage. For example, the mouth will mimic chewing, the stomach will describe churning and adding digestive juices, and the small intestine will explain nutrient absorption. This role-play makes learning about digestion lively and memorable, helping students understand each organ’s role in breaking down and absorbing food.

Life Processes in Animals Extra Questions for Practice

Question 1.
When air is blown from the mouth into a test-tube containing lime water, the lime water turns milky due to the presence of
(a) oxygen
(b) carbon dioxide
(c) nitrogen
(d) water vapour

Question 2.
Oxygen helps break down of glucose to release
(a) water
(b) enzymes
(c) energy
(d) none of these

Question 3.
What is the role of bile in digestion?
(a) Digests proteins
(b) Absorbs nutrients
(c) Neutralises acid
(d) Produces saliva

Question 4.
Read the given statements and select the correct option.
Assertion (A): The liver secretes bile juice.
Reason (R): Bile juice is stored in the small intestine.
(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 A to those in Column B:

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

Question 6.
What is the function of saliva?

Question 7.
Name the balloon-like structures in the respiratory system.

Question 8.
Give the word equation of the process of respiration.

Question 9.
Name the organs that form the digestive system in human beings.

Question 10.
What is the function of bile secreted in the human body?

Question 11.
Arrange the following in the correct sequence: Mouth, stomach, small intestine, oesophagus, large intestine, anus, rectum.

Question 12.
Draw a labelled diagram of human respiratory system.

Question 13.
Give reasons why the diaphragm flattens, and the ribs are lifted when we breathe in.

Question 14.
Give two reasons to explain why absorption of digested food occurs mainly in the small intestine.

Question 15.
How does smoking affect our health?

Question 16.
Draw a labelled diagram of the digestive system of ruminants.

Question 17.
Explain how the exchange of gases occurs in human beings.

Question 18.
Write the differences between respiration taking place in humans and fish.

Question 19.
What do you understand by celiac disease?

Question 20.
What is the difference between breathing and respiration?

Question 21.
What are the functions of the stomach?

Question 22.
Explain the digestive system of a human being with the help of a labelled diagram.

Question 23.
With the help of a diagram, explain the percentage of oxygen and carbon dioxide in inhaled and exhaled air.

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