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The number of NADPH used to fix four molecules of CO2 in the Calvin cycle is

  • (a) 4 Your answer
  • (b) 8 Correct
  • (c) 12 Your answer
  • (d) 16 Your answer
Your answer: Correct answer: (b)
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Explanation

Why (b) is correct

The Calvin cycle uses 2 NADPH per CO2, so four CO2 need 8 NADPH.

Why the other options are wrong

  • (a) · your answer Four would be 1 NADPH per CO2.
  • (c) · your answer Twelve would be 3 per CO2, which is the ATP figure.
  • (d) · your answer Sixteen would be 4 per CO2.
NCERT point: NADPH is used only in the reduction stage.
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