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The primary CO2 acceptor in the Calvin cycle is a

  • (a) 3-carbon compound Your answer
  • (b) 6-carbon sugar Your answer
  • (c) 5-carbon ketose sugar Correct
  • (d) 2-carbon compound Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

The primary CO2 acceptor in the Calvin cycle is RuBP (ribulose bisphosphate), a 5-carbon ketose sugar.

Why the other options are wrong

  • (a) · your answer PEP (3C) is the acceptor in C4 plants.
  • (b) · your answer No 6-carbon sugar accepts CO2 in the Calvin cycle.
  • (d) · your answer A 2-carbon compound is not the acceptor.
NCERT point: RuBP + CO2 → 2 PGA.
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