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How many molecules of CO₂ must be fixed to produce one molecule of glucose?

(a) 1 Your answer
(b) 3 Your answer
(c) 6 Correct
(d) 12 Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

Glucose has six carbons, and each CO₂ supplies one carbon, so six CO₂ must be fixed.

Why the other options are wrong

(a) · your answer One CO₂ gives only one carbon.
(b) · your answer Three CO₂ make a 3-carbon sugar, not glucose.
(d) · your answer Twelve is twice the number needed.

NCERT point: Six turns of the Calvin cycle make one glucose.

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