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In the reduction of CO₂ to carbohydrate in the Calvin cycle, ATP is

(a) formed Your answer
(b) neither formed nor used Your answer
(c) converted to NADPH Your answer
(d) used Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

ATP is used, not formed, in the Calvin cycle: it is needed to reduce PGA and to regenerate RuBP (3 ATP per CO₂ fixed).

Why the other options are wrong

(a) · your answer ATP is formed in the light reaction, not in the Calvin cycle.
(b) · your answer The Calvin cycle does use ATP.
(c) · your answer ATP is not converted to NADPH; both are made separately in the light reaction.

NCERT point: Per CO₂ fixed: 3 ATP + 2 NADPH.

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