Assertion :Main constituent of human urine is ammonia. Reason: If human urine is allowed to stand for some time, it smells strongly of ammonia.

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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Assertion is incorrect but Reason is correct.

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Solution

The correct option is D Assertion is incorrect but Reason is correct.
Urea is the chief nitrogenous constituent of human urine, though it possesses small amount of ammonia. But when the urine is allowed to stand for sometime, urea degrades to form ammonia, which have a strong pungent smell.
Therefore, the correct answer is option D.

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