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Which stage of the Calvin cycle does NOT use ATP or NADPH?

(a) carboxylation Correct
(b) regeneration Your answer
(c) reduction Your answer
(d) all three use ATP Your answer

Your answer: Correct answer: (a)

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Explanation

Why (a) is correct

Carboxylation (CO₂ + RuBP → 2 PGA by RuBisCO) does not use ATP or NADPH.

Why the other options are wrong

(b) · your answer Regeneration uses ATP.
(c) · your answer Reduction uses both ATP and NADPH.
(d) · your answer Carboxylation does not use ATP.

NCERT point: Energy is used in reduction (ATP + NADPH) and regeneration (ATP).

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