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The regeneration of RuBP requires, per CO2 fixed,

  • (a) 2 NADPH Your answer
  • (b) no energy Your answer
  • (c) 2 ATP and 2 NADPH Your answer
  • (d) 1 ATP Correct
Your answer: Correct answer: (d)
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Explanation

Why (d) is correct

Regeneration of RuBP needs 1 ATP for each CO2 fixed. No NADPH is used in this stage.

Why the other options are wrong

  • (a) · your answer NADPH is used in the reduction stage, not in regeneration.
  • (b) · your answer Regeneration does need energy: one ATP per CO2.
  • (c) · your answer 2 ATP and 2 NADPH are used in reduction, not regeneration.
NCERT point: Total per CO2: 3 ATP (2 in reduction + 1 in regeneration) and 2 NADPH.
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