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How many molecules of RuBP are needed to fix six molecules of CO₂?

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

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

One RuBP accepts one CO₂, so six RuBP are needed to fix six CO₂.

Why the other options are wrong

(a) · your answer Three RuBP fix only three CO₂.
(c) · your answer Twelve is the number of PGA formed, not RuBP used.
(d) · your answer Eighteen is the number of ATP used.

NCERT point: The six RuBP are regenerated at the end of the six turns.

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