Question

Assertion: The colour of human urine is yellow.
Reason: The major nitrogenous waste in humans is urea.

• A. Both the assertion and reason are true and the reason is the correct explanation for the assertion
• B. Both the assertion and reason are true but the reason is not the correct explanation for the assertion
• C. Assertion is true but the reason is false
• D. Reason is true but the assertion is false

Answer 1

The correct option is B Both the assertion and reason are true but the reason is not the correct explanation for the assertion

The characteristic colour of human urine is yellow. Hence, the assertion is correct. However, the yellow colour of human urine is due to the presence of pigment urochrome. It is the breakdown product of hemoglobin from worn out RBCs.

Human beings are ureotelic animals, that is, they excrete mainly urea. It is eliminated by urine. Urea is the product of the degradation of amino acids. Hence, the reason is correct but it is not the correct explanation of the assertion.