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

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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 ____________ .

Ans : (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 some time. (T/F)

Ans : (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 some time. (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) food pipe 
(iii) small intestine 
(iv) large intestine

Ans : (a)small intestine.
(b) large intestine 

Q.4: What are villi? What is their location and function?

Ans : Villi are tiny finger-like projections originating from the walls of the small intestine. They increase the surface area for absorption of the digested food. The blood vessels present inside the villi can absorb the nutrients from the digested food. 

Structure of a villus 

Q.5: Where is the bile produced? Which component of the food does it help to digest?

Ans : Liver Secretes the bile juice which is stored in the gallbladder. Bile plays an important role in the digestion of fats. 

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