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The carbon dioxide acceptor in C3 plants is

  • (a) PGA Your answer
  • (b) PEP Your answer
  • (c) RuDP Correct
  • (d) none of these Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

In C3 plants, the CO2 acceptor is the 5-carbon sugar ribulose bisphosphate (RuBP, also called RuDP), which RuBisCO combines with CO2.

Why the other options are wrong

  • (a) · your answer PGA is the product of CO2 fixation, not the acceptor.
  • (b) · your answer PEP is the primary CO2 acceptor in C4 plants.
  • (d) · your answer There is a definite acceptor in C3 plants: RuBP.
NCERT point: RuBP (5C) + CO2 → 2 molecules of 3-PGA (3C), catalysed by RuBisCO.
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