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Which of the following is NOT a stage of the Calvin cycle?

  • (a) regeneration Your answer
  • (b) carboxylation Your answer
  • (c) reduction Your answer
  • (d) photophosphorylation Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

The Calvin cycle has three stages: carboxylation, reduction and regeneration. Photophosphorylation (making ATP using light) belongs to the light reaction.

Why the other options are wrong

  • (a) · your answer Regeneration of RuBP is the third stage of the Calvin cycle.
  • (b) · your answer Carboxylation is the first stage.
  • (c) · your answer Reduction is the second stage.
NCERT point: The Calvin cycle uses the ATP made by photophosphorylation; it does not make it.
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