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In C4 plants, the primary CO2 acceptor is a

  • (a) 4-carbon compound, OAA Your answer
  • (b) 2-carbon compound, glycolate Your answer
  • (c) 5-carbon compound, RuBP Your answer
  • (d) 3-carbon compound, PEP Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

In C4 plants, the primary CO2 acceptor is phosphoenol pyruvate (PEP), a 3-carbon compound.

Why the other options are wrong

  • (a) · your answer OAA is the first product, not the acceptor.
  • (b) · your answer Glycolate is part of photorespiration.
  • (c) · your answer RuBP is the acceptor in the Calvin cycle.
NCERT point: PEP + CO2 → OAA, by PEP carboxylase in the mesophyll.
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