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The number of turns of the Calvin cycle needed to fix the carbon in one molecule of a three-carbon sugar is

(a) 1 Your answer
(b) 2 Your answer
(c) 3 Correct
(d) 6 Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

Each turn fixes one carbon, so three turns are needed to fix the carbon of one 3-carbon sugar (triose).

Why the other options are wrong

(a) · your answer One turn fixes only one carbon.
(b) · your answer Two turns fix only two carbons.
(d) · your answer Six turns make a 6-carbon sugar.

NCERT point: Triose phosphate is the 3-carbon sugar made in the Calvin cycle.

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