(D) The main nitrogenous waste product in human urine is $Urea$,not $Ammonia$.Therefore,the Assertion is incorrect.However,when urine is left to stand

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If both the Assertion and Reason are incorrect.

(D) The main nitrogenous waste product in human urine is $Urea$,not $Ammonia$.Therefore,the Assertion is incorrect.However,when urine is left to stand,bacteria decompose the $Urea$ present in the urine,leading to the production of $Ammonia$,which causes a strong pungent smell.Thus,the Reason is correct.

Class 11 Biology Excretory Products and their Elimination Excretory waste products

Easy

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

AIIMS 2013 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.