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How many molecules of 3-PGA are formed when six molecules of CO₂ are fixed?

(a) 6 Your answer
(b) 12 Correct
(c) 18 Your answer
(d) 3 Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

Each CO₂ fixed gives two molecules of 3-PGA, so six CO₂ give twelve 3-PGA.

Why the other options are wrong

(a) · your answer Six would be one PGA per CO₂; it is two.
(c) · your answer Eighteen is the ATP count, not the PGA count.
(d) · your answer Three is too few.

NCERT point: RuBP + CO₂ → 2 × 3-PGA.

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