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In the Calvin cycle, the ratio of ATP to NADPH used is

(a) 2 : 3 Your answer
(b) 3 : 2 Correct
(c) 1 : 1 Your answer
(d) 2 : 1 Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

The Calvin cycle uses 3 ATP and 2 NADPH per CO₂ fixed, so the ratio of ATP to NADPH is 3 : 2.

Why the other options are wrong

(a) · your answer This reverses the ratio.
(c) · your answer More ATP than NADPH is used.
(d) · your answer The ratio is 3 : 2, not 2 : 1.

NCERT point: Per CO₂ fixed, the Calvin cycle uses 3 ATP and 2 NADPH.

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