Germs entering the body through food are mainly killed in the region of alimentary canal where pH may reach the level

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Solution

The correct option is D 2
Digestion in the human body is a complex process where pH of the digestive tract plays a crucial role. pH level in the region of pharynx and mouth is controlled by the saliva and is maintained at about 6.8. However, in the stomach, the gastric acid lowers the pH to 1-3 making it highly acidic. This acidic condition activates the digestive enzyme pepsinogen and converts it into pepsin for protein digestion and kills the pathogenic bacteria. Therefore, the correct answer is option A.

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