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Which of the following is NOT required for the Calvin cycle?

(a) NADPH Your answer
(b) direct light Correct
(c) CO₂ Your answer
(d) ATP Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

The Calvin cycle does not need light directly. It needs ATP and NADPH (from the light reaction) and CO₂.

Why the other options are wrong

(a) · your answer NADPH is needed for the reduction stage.
(c) · your answer CO₂ is the substrate fixed.
(d) · your answer ATP is needed for reduction and regeneration.

NCERT point: The Calvin cycle is light-independent, but it depends on light for ATP and NADPH.

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