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Of the 3 ATP used per CO2 fixed in the Calvin cycle,

  • (a) all 3 are used in carboxylation Your answer
  • (b) 2 are used in reduction and 1 in regeneration Correct
  • (c) 3 are used in regeneration Your answer
  • (d) 1 is used in reduction and 2 in regeneration Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

Of the 3 ATP per CO2, 2 are used in the reduction stage and 1 in regeneration of RuBP.

Why the other options are wrong

  • (a) · your answer Carboxylation uses no ATP.
  • (c) · your answer Only 1 ATP is used in regeneration.
  • (d) · your answer This reverses the split.
NCERT point: Reduction: 2 ATP + 2 NADPH; regeneration: 1 ATP.
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