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NEET UG BIOLOGY MCQ: EXCRETORY PRODUCTS AND THEIR ELIMINATION

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Assertion (A): Human kidneys can produce urine nearly two times concentrated than the initial filtrate formed.

Reason (R): Counter current mechanism doesn’t help to maintain a concentration gradient in the medullary interstitium.

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Correct option: D

Assertion (A) is false, and Reason (R) is true

Option C (Assertion (A) is true, and Reason (R) is false) is correct because human kidneys can produce urine about four times concentrated than the initial filtrate, but the countercurrent mechanism *does* help maintain the concentration gradient.

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