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The Calvin cycle (reductive pentose phosphate cycle) is basically a

(a) photochemical reaction Your answer
(b) CO₂ reduction cycle Correct
(c) CO₂ oxidation cycle Your answer
(d) proton-pumping cycle Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

In the Calvin cycle CO₂ is fixed and then reduced to sugar using ATP and NADPH, so it is a CO₂ reduction cycle (reductive pentose phosphate cycle).

Why the other options are wrong

(a) · your answer The Calvin cycle does not use light directly; it is not photochemical.
(c) · your answer CO₂ is reduced, not oxidised.
(d) · your answer Proton pumping happens in the light reaction, not the Calvin cycle.

NCERT point: Carboxylation → reduction → regeneration.

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In C3 plants, the CO2 acceptor and the carboxylating enzyme are, respectively, Which of the following is NOT a stage of the Calvin cycle? Which copper-containing protein acts as a mobile electron carrier between the cytochrome b6f complex and PS I?