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The stage of the Calvin cycle that forms the CO₂ acceptor again is

(a) decarboxylation Your answer
(b) reduction Your answer
(c) regeneration Correct
(d) carboxylation Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

In the regeneration stage, RuBP (the CO₂ acceptor) is formed again, using 1 ATP per turn, so the cycle can continue.

Why the other options are wrong

(a) · your answer Decarboxylation is not a stage of the Calvin cycle.
(b) · your answer Reduction forms triose phosphate (sugar), not the acceptor.
(d) · your answer Carboxylation uses up RuBP; it does not regenerate it.

NCERT point: Without regeneration of RuBP, CO₂ fixation would stop.

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