NCERT Solutions for Class 7 Science Chapter 2 Nutrition In Animal

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Updated at 2021-02-11


NCERT solutions for class 7 Science Chapter 2 Nutrition In Animal Exercise

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 Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

(a) The main steps of nutrition in humans are __ingestion__, __digestion__, __absorption__, __assimilation__ and __egestion__.
(b) The largest gland in the human body is __Liver__.
(c) The stomach releases hydrochloric acid and __digestive__ juices which act on food.
(d) The inner wall of the small intestine has many finger-like outgrowths called __villi__.
(e) Amoeba digests its food in the 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 sometime. (T/F)



NCERT Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

(a) Digestion of starch starts in the stomach. (F)
(b) The tongue helps in mixing food with saliva. (T)
(c) The gall bladder temporarily stores bile. (T)
(d) The ruminants bring back swallowed grass into their mouth and chew it for sometime. (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 Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

(a) (iii) Small intestine
(b) (iv) Large intestine

Q.4 Match the items of Column I with those given in Column II:
Column- I. Column- II
Food components. Product(s) of digestion
Carbohydrates. Fatty acids and glycerol
Proteins Sugar
Fats. Amino acids



NCERT Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

Column- I. Column- II Food components. ?Product(s) of digestion Carbohydrates. ?. Sugar Proteins ? Amino acids Fats. ? Fatty acids and glycerol

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



NCERT Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

The finger like projections in the inner walls of the small intestine is called villi.
The villi increase the surface area for absorption of the digested food.

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



NCERT Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

Bile is produced in liver. It help the digestion of fats.

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



NCERT Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

Cellulose is a type of carbohydrate that can be digested by ruminants and not by humans. Ruminants have a large sac-like structure between small and large intestine where the food containing cellulose is digested by the action of certain bacteria. On the other hand, humans cannot digest cellulose, as the cellulose digesting enzymes are absent in them.

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



NCERT Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

Glucose is a simple sugar. Carbohydrates, when consumed, have to be digested into glucose. As glucose can be easily absorbed in the blood, it provides energy to the body. Hence, when glucose is directly taken, it does not have to be digested and thus acts as an instant source of energy.

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 Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

(i) Absorption of food __small intestine __.
(ii) Chewing of food ___mouth___.
(iii) Killing of bacteria __stomach__.
(iv) Complete digestion of food __small intestine__.
(v) Formation of faeces __large intestine__ .

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



NCERT Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

Similarity: Both amoeba and human beings follow the holozoic type of nutrition.
Humans have a mouth and a complex digestive system mouth and digestive system are absent in Amoeba.

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 Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

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

Q.12 Label Fig. 2.11 of the digestive system.



NCERT Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

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



NCERT Solutions for Class 7 Science Chapter 2 Nutrition In Animal


Answer :

No. Humans cannot survive only on raw, leafy vegetables, or grass. It is because the grass is rich in cellulose, which is a type of carbohydrate that humans are not able to digest due to the absence of cellulose-digesting enzymes.



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