UPSC Prelims 2002·GS1·science-and-technology·science and technology

Assertion (A): Drinking of whisky increases the frequency of urination. Reason (R): Alcohol intake speeds up the secretion of vasopressin in the body.

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  1. ABoth A and R are individually true and R is the correct explanation of A
  2. BBoth A and R are individually true but R is not a correct explanation of A
  3. CA is true but R is falseCorrect
  4. DA is false but R is true

Explanation

Assertion A is true because alcohol acts as a diuretic, which increases the production of urine and the frequency of urination. Reason R is false because alcohol actually inhibits or suppresses the secretion of vasopressin also known as anti-diuretic hormone from the posterior pituitary gland. Vasopressin normally helps the kidneys reabsorb water back into the bloodstream. When alcohol decreases vasopressin levels, the kidneys do not reabsorb as much water, leading to increased urine output. Therefore, alcohol slows down rather than speeds up the secretion of vasopressin. Since the assertion is true but the reason is false, the correct option is C.
science-and-technology: Assertion (A): Drinking of whisky increases the frequency of urination. Reason (R): Alcohol intake speeds up the secreti
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