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Which pair is correctly matched with respect to the Calvin cycle?

(a) Regeneration - uses NADPH only Your answer
(b) Reduction - uses ATP and NADPH Correct
(c) Carboxylation - uses ATP and NADPH Your answer
(d) Carboxylation - forms RuBP Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

The reduction stage uses ATP and NADPH. The other pairs are wrong.

Why the other options are wrong

(a) · your answer Regeneration uses ATP only, not NADPH.
(c) · your answer Carboxylation uses neither ATP nor NADPH.
(d) · your answer Carboxylation uses up RuBP; it forms 3-PGA.

NCERT point: Only carboxylation is free of ATP and NADPH.

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Which stage of the Calvin cycle does NOT use ATP or NADPH? How many molecules of 3-PGA are formed when six molecules of CO2 are fixed? How many molecules of RuBP are needed to fix six molecules of CO2?