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Standard XII
Biology
Question

Assertion :Main constituent of human urine is ammonia. Reason: If human urine is allowed to stand for some time, it smells strongly of ammonia.
  1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
  3. Assertion is correct but Reason is incorrect.
  4. Assertion is incorrect but Reason is correct.

A
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
B
Assertion is correct but Reason is incorrect.
C
Assertion is incorrect but Reason is correct.
D
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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Solution
Verified by Toppr

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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