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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.

  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 means increased urine output, so preventing it requires conserving water in the body. Aldosterone (released via the renin-angiotensin mechanism) causes reabsorption of Na+ and water from the distal parts of the tubule, which retains water and thus prevents diuresis. Option (A) is wrong because ANF causes vasodilation, not vasoconstriction; (B) less renin means less aldosterone and so more water loss; (C) is self-contradictory because undersecretion of ADH reduces water reabsorption and actually increases urine. NCERT Reference: Ch 16, p.212, line(s) 28-30 — "Aldosterone causes reabsorption of Na+ and water from the distal parts of the tubule."

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