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Solution


Q.

Assertion: Presence of HCl in stomach is necessary for the process of digestion.
Reason: HCl kills and inhibits the growth of bacteria in the stomach.
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.  
3 Assertion is true but Reason is false.  
4 Assertion is false but Reason is true  

Ans.

(2)

Presence of HCl in stomach is necessary for digestion because acidic medium activates the action of gastric juice. HCl maintains a strong acidic pH, of about 1–2 in the stomach. HCl helps to activate Pepsinogen to pepsin which digests proteins to peptones and proteases. HCl inhibits the growth of germs and also kills them those may have entered the stomach along with the food. So, thus it can be said that HCl kills bacteria but that does not help in digestion. Thus, both assertion and reason are correct but reason is not the correct explanation of the assertion.