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Which product of the light reaction is used in both the reduction and the regeneration stages of the Calvin cycle?

  • (a) ATP Correct
  • (b) O2 Your answer
  • (c) NADPH Your answer
  • (d) water Your answer
Your answer: Correct answer: (a)
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Explanation

Why (a) is correct

ATP is used in both the reduction stage (2 per CO2) and the regeneration stage (1 per CO2).

Why the other options are wrong

  • (b) · your answer O2 is not used in the Calvin cycle.
  • (c) · your answer NADPH is used only in reduction.
  • (d) · your answer Water is not a light-reaction product used in these stages.
NCERT point: NADPH: reduction only. ATP: reduction and regeneration.
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