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The CO2 released by decarboxylation in bundle sheath cells is fixed by

  • (a) PEPcase Your answer
  • (b) RuBisCO Correct
  • (c) carbonic anhydrase Your answer
  • (d) NADP reductase Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

The CO2 released in the bundle sheath is fixed by RuBisCO and enters the Calvin cycle.

Why the other options are wrong

  • (a) · your answer PEPcase is in the mesophyll, not the bundle sheath.
  • (c) · your answer Carbonic anhydrase is not described as fixing CO2 into the Calvin cycle.
  • (d) · your answer NADP reductase reduces NADP+.
NCERT point: Bundle sheath: high CO2, RuBisCO, Calvin cycle.
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