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NCERT Solutions for Class 7 Science: Chapter 2 – Nutrition in Animals

Jun 12, 2019 18:16 IST
NCERT Solutions for Class 7 Science: Chapter 2

NCERT Solutions for Class 7 Science, Chapter 2 – Nutrition in Animals is available here. With this article, you can also download the PDF of this Chapter (i.e., Nutrition in Animals of Class 7 Science NCERT textbook). All the questions of this chapter are important for the preparation CBSE Class 7 Science exam conducted in various CBSE Schools.

Some of the important topics or keywords of Class 7 NCERT Textbook, Chapter 2 are Absorption, Amino acid, Amoeba, Assimilation, Bile, Buccal cavity, Canine, Cellulose, Digestion, Egestion, Fatty acid, Food vacuole, Gall bladder ,Glycerol, Incisor, Ingestion, Liver, Milk teeth, Molar, Permanent teeth, Oesophagus, Pancreas, Premolar, Pseudopodia, Rumen, Ruminant, Rumination, Salivary glands, Villi, Saliva. Most of the questions given in the exercise of this chapter are based on these topics.

NCERT Solutions for Class 7 Science, Chapter 2 – Nutrition in Animals are given below

Question1. Fill in the blanks:

(a) The main steps of nutrition in humans are __________, __________, __________, _________ and __________.

Solution 1(a):

The main steps of nutrition in humans are ___ingestion___, ___digestion___, ___absorption___, ___assimilation___ and __egestion__.

(b) The largest gland in the human body is __________.

Solution 1(b):

The largest gland in the human body is ___liver___.

(c) The stomach releases hydrochloric acid and ___________ juices which act on food.

Solution 1(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 _________.

Solution 1(d):

The inner wall of the small intestine has many finger-like outgrowths called ___villi___.

(e) Amoeba digests its food in the ____________ .

Solution 1(e):

Amoeba digests its food in the ___food vacuole___.

2. Mark ‘T’ if the statement is true and ‘F’ if it is false:

(a) Digestion of starch starts in the stomach. (T/F)

Solution 2(a):

False.

(b) The tongue helps in mixing food with saliva. (T/F)

Solution 2(b):

True.

(c) The gall bladder temporarily stores bile. (T/F)

Solution 2(c):

True.

(d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T/F)

Solution 2(d):

True.

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

Solution 3(a):

Small intestine.

(b) Water from the undigested food is absorbed mainly in the

(i) stomach (ii) foodpipe (iii) small intestine (iv) large intestine

Solution 3(b):

Large intestine.

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

Solution (4):

Column I                              Column II

Food components           Product(s) of digestion

Carbohydrates           Sugar

Proteins                    Amino acids

Fats                          Fatty acids and glycerol

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

Solution (5):

Villi (singular villus) are finger-like outgrowths on the inner walls of the small intestine. The villi increase the surface area for absorption of the digested food. Each villus has a network of thin and small blood vessels close to its surface. The surface of the villi absorbs the digested food materials.

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

Solution (6):

The bile juice is produced by the liver. It plays an important role in the digestion of fats.

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

Solution (7):

The name of the carbohydrate is cellulose. It is digested by ruminants but not by humans because enzymes which digest cellulose are not present in humans.

8. Why do we get instant energy from glucose?

Solution (8):

Glucose is the simplest form of carbohydrates and easily gets absorbed by the blood and hence provides instant energy.

9. Which part of the digestive canal is involved in

(i) absorption of food ________________.

Solution 9 (i):

Absorption of food __small intestine__.

(ii) chewing of food ________________.

Solution 9 (ii):

Chewing of food __buccal cavity__

(iii) killing of bacteria ________________.

Solution 9 (iii):

Killing of bacteria __stomach__

(iv) complete digestion of food ________________.

Solution 9 (iv):

Complete digestion of food ___small intestine___.

(v) formation of faeces ________________.

Solution 9 (v):

Formation of faeces __large intestine__.

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

Solution 10:

Similarity: Human and amoeba both need digestive juices for the digestion of food.

Difference: Humans need to chew the food on the other hand amoeba does not need to chew the food.

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

Solution 11:

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

12. Label Fig. 2.11 of the digestive system

NCERT Solutions for Class 7 Science Chapter 2 - Nutrition in Animals: Question 12

Solution 12:

NCERT Solutions for Class 7 Science Chapter 2 - Nutrition in Animals: Question 12

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

Solution 13:

No, we cannot survive for a very long time by only eating leafy and raw vegetables/grass. We need a balance diet to live long and healthy life. Also, the grass contains cellulose which can be digested by the human body.

Download Chapter 2 (Nutrition in Animals) of Class 7 Science NCERT Textbook in PDF Format