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NEET2012ZoologyExcretory Products and their EliminationActual

Assertion : In proximal convoluted tubule glomerular filtrate becomes hypertonic to blood plasma. Reason : HCO ₃⁻ is absorbed only in the proximal convoluted tubule.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false

Correct answer

D. If both assertion and reason are false

Step-by-step solution

In proximal convoluted tubule (PCT) about 65 % of the glomerular filtrate is reabsorbed normally. Here most of the solutes are reabsorbed making the filtrate isotonic to blood plasma. HCO ₃⁻ is not absorbed in PCT.

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