Given below are two statements : one is… - NEET UG 2023 Zoology PYQ

NEET UG 2023 — Zoology Excretory Products and their Elimination

2023mcqhard

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Ascending limb of loop of Henle is impermeable to water and allows transport of electrolytes actively or passively. Reason (R) : Dilution of filtrate takes place due to efflux of electrolytes in the medullary fluid. In the light of the above statements, choose the correct answer from the options given below :

Official previous-year question

Held on 30 Apr 2023 · Verified 9 Jul 2026.

Options

A
Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$
B
Both $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A)$
C
$(A)$ is true but (R) is false
D
$(A)$ is true but (R) is true

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Solution

Option (2) is the answer because both (A) and $(R)$ are true but $(R)$ is not the correct explanation of $(R)$ . Dilution of filtrate takes place as a result of passage of electrolytes actively or passively to the medullary interstitium when the concentrated filtrate passes through ascending limb of loop of Henle. This is due to the fact that ascending limb of loop of Henle is impermeable to water and allows transport of electrolytes.

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