Q. 1104.5( 4 Votes )
X is a wild animal which eats only the flesh of other animals whereas Y is a domestic animal which feeds mainly on green grass.
(a) What are animals like X known as?
(b) What are animals like Y known as ?
(c) Which animal, X or Y, has a longer small intestine? Why?
(d) Name one animal which is like X.
(e) Name one animal which is like Y.
(c) Animal (Y) has a longer small intestine. Y is an herbivorous animal which eats grass. Grass contains cellulose which is a carbohydrate and gets digested with difficulty. A longer small intestine facilitates complete digestion of cellulose.
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Study the given diagram:
Name the parts ‘A’ and ‘B’ and state one function of each.
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When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is an enzyme for digestion. The partially digested food then enters into small intestine for further digestion.
(a) What is (i) gland A
(ii) substance B, and (iii) enzyme C?
(b) Name the tube D.
(c) What is the movement E known as?
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