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Which of the following correctly explains why both ATP and NADPH are needed from the light reaction?

  • (a) NADPH is used to make ATP in the stroma. Your answer
  • (b) ATP is needed only to split water and NADPH only to make O2. Your answer
  • (c) The Calvin cycle uses ATP for phosphorylation and NADPH for reduction. Correct
  • (d) Both are used only in photorespiration. Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

The Calvin cycle uses ATP to phosphorylate (in reduction and regeneration) and NADPH to reduce 3-PGA. So it needs both.

Why the other options are wrong

  • (a) · your answer NADPH is not used to make ATP.
  • (b) · your answer Neither is used to split water or make O2.
  • (d) · your answer They are used in the Calvin cycle, not photorespiration.
NCERT point: Per CO2: 3 ATP + 2 NADPH.
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