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Arrange the following events of the Calvin cycle in the correct order: (1) regeneration of RuBP (2) carboxylation of RuBP (3) reduction of 3-PGA

  • (a) 1, 2, 3 Your answer
  • (b) 2, 3, 1 Correct
  • (c) 2, 1, 3 Your answer
  • (d) 3, 2, 1 Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

The Calvin cycle goes carboxylation (2) → reduction (3) → regeneration (1).

Why the other options are wrong

  • (a) · your answer Regeneration comes last, not first.
  • (c) · your answer Reduction comes before regeneration.
  • (d) · your answer Carboxylation comes first, before reduction.
NCERT point: The order cannot change: RuBP must take up CO2 before PGA can be reduced.
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