NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals

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Last Updated on May 15, 2024 by XAM CONTENT

The NCERT Solutions have been updated for 2024-2025 sessions, with the new NCERT Books. All questions are solved with detailed explanation of each and every questions. In this article, we are providing NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals.

NCERT Solutions	Class 7 Science
Session	2024-2025
Useful for	Class 7 Students
Chapter	Nutrition in Animals Chapter 2
No. of Intext Questions	4
Exercise Questions	13
Format	Question-Answer Format

[PDF] Nutrition in Animals Class 7 NCERT Solutions Science Chapter 2

NCERT Solutions

Intext Questions

Page – 11

Q.1. You have studied in previous class that food consists of many components. Try to recall and list them
Ans. 1. Carbohydrates
2. Proteins
3. Fat
5. Minerals
6. Roughage

Page – 15

Q.2. Paheli wants to know how food moves in the opposite direction during vomiting.
Ans. The food moves in the opposite direction during vomiting by creating reverse peristaltic movement in the oesophagus. During vomiting, peristaltic movement reverses their normal direction and the food is expelled out through mouth.

Page – 18

Q. 3. Paheli wants to know why ruminants cannot chew food properly at the time they take it in?
Ans. The ruminants mainly live on grass and bushes which always contain cellulose or roughage. For the splitting of cellulose, a lot of chewing and saliva is necessary. So, the ruminants need to chew the grass for a long time. So, they chew it twice. If they chew for long while eating, they will get less time to eat.

Q.4. Boojho wants to know why we cannot digest cellulose like the cattle do?
Ans. Ruminants have a large sac-like structure known as rumen which is located between the small intestine and large intestine. The cellulose of the food is digested here by the action of certain bacteria which are not present in humans.

Exercise Questions

Q.1. Fill in the blanks:
(a) The main steps of nutrition in humans are __________, __________, __________, __________ and __________.
(b) The largest gland in the human body is __________
(c) The stomach releases hydrochloric acid and __________juices which act on food.
(d) The inner wall of the small intestine has many finger-like outgrowths called __________
(e) Amoeba digests its food in the __________

[NCERT Ex. Q.1, Page 20]

Ans. (a) ingestion, digestion, absorption, assimilation and egestion. (b) liver, (c) digestive, (d) villi, (e) food vacuole.

Q. 2. Mark ‘T’ if the statement is true and ‘F’ if it is false:
(a) Digestion of starch starts in the stomach. (T/F)
(b) The tongue helps in mixing food with saliva. (T/F)
(c) The gall bladder temporarily stores bile.  (T/F)
(d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T/F)

[NCERT Ex. Q.2, Page 20]

Ans. (a) F, (b) T, (c) T, (d) T.

Q. 3. Tick (✓) mark the correct answer in each of the following:
(a) Fat is completely digested in the
(i) stomach ( ) (ii) mouth ( ) (iii) small intestine ( ) (iv) large intestine ( )
(b) Water from the undigested food is absorbed mainly in the
(i) stomach ( ) (ii) foodpipe ( ) (iii) small intestine ( ) (iv) large intestine ( )

[NCERT Ex. Q.3, Page 20]

Ans. (a) (iii) small intestine, (b) (iv) large intestine

Q. 4. Match the items given in Column I with those in Column II:

Column I Food components	Column II Product(s) of digestion
(a) Carbohydrates	(i) Fatty acids and glycerol
(b) Proteins	(ii) Sugar
(c) Fats	(iii) Amino acids

[NCERT Ex. Q.4, Page 21]

Ans.

Column I Food components	Column II Product(s) of digestion
(a) Carbohydrates	(ii) Sugar
(b) Proteins	(iii) Amino acids
(c) Fats	(i) Fatty acids and glycerol

Q. 5. What are villi? What is their location and function?

[NCERT Ex. Q.5, Page 21]

Ans. The inner walls of the small intestine have a very large number of finger-like outgrowths. These are known as villi which are located in the small intestine. The villi enlarge the surface area for absorption of the digested food. Each villi has a network of thin and small blood vessels close to its surface. The surface of the villi absorbs the digested food stuff.

Q. 6. Where is the bile produced? Which component of the food does it help to digest?

[NCERT Ex. Q.6, Page 21]

Ans. Bile is produced by liver and gets stored in gall bladder. Bile juice digests fat.

Q. 7. Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.

[NCERT Ex. Q.7, Page 21]

Ans. Cellulose is a type of carbohydrate which can be digested by ruminants but not by human. Ruminants have a large sac-like structure known as rumen which is present in between the small intestine and large intestine. The cellulose is digested here by the action of certain bacteria which are not present in humans.

Q. 8. Why do we get instant energy from glucose?

[NCERT Ex. Q.8, Page 21]

Ans. Glucose is the simplest form of carbohydrate which can be broken down by oxygen, during respiration, easily to give energy. So, glucose is called instant energizer.

Q. 9. Which part of the digestive canal is involved in:
(i) Absorption of food _______________
(ii) Chewing of food _______________
(iii) Killing of bacteria _______________
(iv) Complete digestion of food _______________
(v) Formation of faeces _______________

[NCERT Ex. Q.9, Page 21]

Ans. (i) small intestine, (ii) buccal cavity, (iii) stomach, (iv) small intestine, (v) large intestine.

Q.10. Write one similarity and one difference between the nutrition in amoeba and human beings.

[NCERT Ex. Q.10, Page 21]

Ans. Similarity: Both Amoeba and human use digestive juices to digest food.
Difference: Human needs to chew food, whereas in Amoeba, there is no chewing.

Q. 11. Match the items of Column I with suitable items in Column II:

Column I	Column II
(a) Salivary gland	(i) Bile juice secretion
(b) Stomach	(ii) Storage of undigested food
(c) Liver	(iii) Saliva secretion
(d) Rectum	(iv) Acid release
(e) Small intestine	(v) Digestion is completed
(f) Large intestine	(vi) Absorption of water
	(vii) Release of faeces

[NCERT Ex. Q.11, Page 21]

Ans. The correct match of both columns

Column I	Column II
(a) Salivary gland	(iii) Saliva secretion
(b) Stomach	(iv) Acid release
(c) Liver	(i) Bile juice secretion
(d) Rectum	(vii) Release of faeces
(e) Small intestine	(v) Digestion is completed
(f) Large intestine	(vi) Absorption of water

Q.12. Label the given Figure of the digestive system:

A part of human digestive system

[NCERT Ex. Q.12, Page 22]

Ans.

Human digestive system

Q. 13.Can we survive only on raw, leafy vegetables/grass? Discuss.

[NCERT Ex. Q.13, Page 22]

Ans. No, because to live a healthy life we need a complete balance of all nutrients. Raw green vegetables may have cellulose which cannot be digested by us. So, only green leafy vegetables will not solve the purpose.

Also check

• NCERT Solutions for Class 7 Science Chapter 2 Nutrition in Animals
• NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants

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