Neco 2025 Biology Question 42

Practice objective / multiple choice question 42 from the 2025 Neco Biology examination.

Neco 2025 Biology Objective / Multiple Choice Medium Difficulty
Question 42 NECO • 2025 • BIOLOGY • objective
Neco 2025 Biology Question 42 diagram

Refer to the labelled diagram of the nephron. (a) Identify the segment where water reabsorption is most strongly regulated by antidiuretic hormone (ADH). (b) Explain what would happen to urine volume and concentration if a defect prevented ADH from acting on this segment.

Answer Options

A. Distal convoluted tubule; the urine would be produced in a large volume but remain hypertonic because ADH would cause excessive sodium re‑absorbed, resulting in concentrated urine.
B. Loop of Henle; the urine would be produced in a moderate volume and would be slightly concentrated because water re‑absorbed in the descending limb would be increased, causing mild oliguria.
Correct Answer C. Collecting duct; the urine would be produced in a large volume and would be very dilute because water cannot be re‑absorbed, resulting in polyuria.
D. Proximal convoluted tubule; the urine would be produced in a small volume and would be highly concentrated because water re‑absorbed would be increased, leading to oliguria.
Correct Answer
C
Correct Option:
Collecting duct; the urine would be produced in a large volume and would be very dilute because water cannot be re‑absorbed, resulting in polyuria.

About This Question

This is Neco 2025 Biology Question 42. It is one of the objective questions from the 2025 Neco Biology examination.

Difficulty level: Medium .

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