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Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in

  • (a) C2 plants Your answer
  • (b) C4 plants Correct
  • (c) C3 plants Your answer
  • (d) C3 and C4 plants Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

In C4 plants, phosphoenol pyruvate (PEP, a 3-carbon compound) is the primary CO2 acceptor in the mesophyll cells, with PEP carboxylase as the enzyme.

Why the other options are wrong

  • (a) · your answer "C2 plants" is not a group of plants described in NCERT; only C3 and C4 pathways are.
  • (c) · your answer In C3 plants the acceptor is RuBP.
  • (d) · your answer C3 plants use RuBP, not PEP.
NCERT point: C4: PEP + CO2 → OAA (4C) in the mesophyll.
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