Assertion :Most possibly gastric rennin has no functional role in human beings. Reason: Its optimum pH is 6.0 - 6.5, which is much higher than normal gastric juice.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is D Both Assertion and Reason are incorrect.
Rennin is the enzyme present in the gastric juice of only infants and not of adult human. In adults, it is replaced by pepsin. It is secreted as inactive prorennin. Like pepsinogen, prorennin is activated by H+ ions to from rennin. Its function is to coagulate milk. The optimal pH for the enzyme is 1.8.

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