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The enzyme responsible for the first CO2 fixation in C4 plants is

  • (a) RuBisCO Your answer
  • (b) PEP carboxylase (PEPcase) 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

PEP carboxylase (PEPcase) fixes CO2 first in C4 plants, in the mesophyll cells.

Why the other options are wrong

  • (a) · your answer RuBisCO fixes CO2 a second time, in the bundle sheath.
  • (c) · your answer Carbonic anhydrase is not described as the first fixing enzyme in NCERT.
  • (d) · your answer NADP reductase reduces NADP+.
NCERT point: PEPcase fixes CO2 in the mesophyll; the mesophyll cells of C4 plants lack RuBisCO.
What is wrong?
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