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Which of the following is a direct product of the reduction stage of the Calvin cycle?

(a) phosphoglycolate Your answer
(b) ribulose bisphosphate Your answer
(c) oxaloacetic acid Your answer
(d) triose phosphate Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

In the reduction stage, 3-PGA is reduced (using ATP and NADPH) to triose phosphate, a 3-carbon sugar.

Why the other options are wrong

(a) · your answer Phosphoglycolate is formed in photorespiration.
(b) · your answer RuBP is formed in the regeneration stage.
(c) · your answer OAA is formed in C₄ fixation.

NCERT point: Triose phosphate is the sugar that leaves the cycle to form glucose and sucrose.

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