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NEET 2020 · BiologyPrevious Year Question

Which of the following would help in prevention of diuresis?

Answer: (D) Reabsorption of Na+ and water from renal tubules due to aldosterone. Answer: (d) Reabsorption of Na+ and water from renal tubules due to aldosterone Solution: Diuresis is excessive urine output, so preventing it requires conserving water.

  1. A.Atrial natriuretic factor causes vasoconstriction
  2. B.Decrease in secretion of renin by JG cells
  3. C.More water reabsorption due to undersecretion of ADH
  4. D.Reabsorption of Na+ and water from renal tubules due to aldosterone✓

Correct Answer

(D) Reabsorption of Na+ and water from renal tubules due to aldosterone

Solution & Explanation

Answer: (d) Reabsorption of Na+ and water from renal tubules due to aldosterone Solution: Diuresis is excessive urine output, so preventing it requires conserving water. Aldosterone acts at the renal tubules and stimulates reabsorption of Na⁺ and water, conserving body fluid and thus opposing diuresis. The other options (ANF causing vasoconstriction is wrong—it dilates; reduced renin and undersecretion of ADH both promote water loss) would not prevent diuresis. NCERT Reference: Chapter 19, Page 245, Line(s) 19-21 — "Aldosterone acts mainly at the renal tubules and stimulates the reabsorption of Na+ and water"

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