Question 5
The acid present in the stomach

(a) Kills the harmful bacteria that may enter along with the food.
(b) Protects the stomach lining from harmful substances.
(c) Digests starch into simpler sugars.
(d) Makes the medium alkaline.

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Solution

The answer is option (a).

The hydrochloric acid is secreted by the inner walls of the stomach. The role of acid in the stomach are:
i) Kills the harmful bacteria that may enter along with the food.
ii) Makes the medium acidic which is required for the activation of digestive enzymes.
iii) Soften the food for easy digestion.

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Q. Question 5
The acid present in the stomach

(a) Kills the harmful bacteria that may enter along with the food.
(b) Protects the stomach lining from harmful substances.
(c) Digests starch into simpler sugars.
(d) Makes the medium alkaline.

Q. The stomach wall secretes gastric juice containing three substances 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.

(b) Name the tube D.

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