Nutrition in Animals NCERT Solutions for class 7 Science

NCERT Solutions For Class 7 Science Chapter 2 Nutrition in Animals is a crucial unit of the Class 7 syllabus and students must prepare it well to score better in their exams. SimplyAcad has brought the best NCERT Solutions for Class 7 Nutrition in Animals to help students learn the concepts. The study material is provided with all the answers of the questions given in your NCERT Class 7 Science textbook. Scroll below to access them and remember to practise it daily.

NCERT Solutions of Nutrition in Animals

Question 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 ____________ .

Solution:

(a) The main steps of nutrition in humans are ingestion, digestion, absorption, assimilation, and egestion.

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

Question 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)

Solution:

(a) F

(b) T

(c) T

(d) T

Question 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) food pipe
(iii) small intestine
(iv) large intestine

Solution:

(a) (iii) small intestine

(b) (iv) large intestine

Question 4.

Match the items of Column I with those given in Column II:

Column I
Food components

Column II
Product(s) of digestion

Carbohydrates
Proteins
Fats

Solution:

Column I
Food components

Column II
Product(s) of digestion

Carbohydrates — Sugar
Proteins — Amino acids
Fats — Fatty acids and glycerol

Question 5.

What are villi? What is their location and function?

Solution:

Villi are finger-like projections or outgrowths. They are present in the small intestine of our digestive system. The villi increase the surface area for absorption of the digested food.

Question 6.

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

Solution:

Bile juice is produced in the liver, and it helps in the digestion of fats by breaking large fat globules into smaller ones.

Question 7.

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

Solution:

Cellulose is the carbohydrate that can be digested by ruminants but not by humans because humans lack the cellulose enzyme required to digest cellulose.

Question 8.

Why do we get instant energy from glucose?

Solution:

Glucose is a simple sugar that is easily absorbed into the blood, whereas other carbohydrates are first broken down into glucose and then absorbed; hence, glucose gives instant energy.

Question 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 ________________.

Solution:

(i) Small intestine

(ii) Buccal cavity

(iii) Stomach

(iv) Small intestine

(v) Large intestine

Question 10.

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

Solution:

Similarity: Both amoeba and human beings follow the holozoic type of nutrition.

Difference:
Humans intake food through a buccal cavity, while in amoeba, food is ingested through pseudopodia.

Question 11.

Match the items of Column I with suitable items in Column II

Column I
a) Salivary gland
b) Stomach
c) Liver
d) Rectum
e) Small intestine
f) Large intestine

Column II
(i) Bile juice secretion
(ii) Storage of undigested food
(iii) Saliva secretion
(iv) Acid release
(v) Digestion is completed
(vi) Absorption of water

Solution:

Column I
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

Question 12.

Label Fig. 2.11 of the digestive system.

Solution:

Question 13.

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

Solution:

No, we cannot survive only on raw, leafy vegetables because they mainly consist of cellulose, which cannot be digested by us due to a lack of cellulose-digesting enzymes in our body