During dark reaction for fixation of carbon, the three carbon atoms of each molecule of 3 phosphoglyceric acid (PGA) are derived from

RuBP only

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RuBP +CO₂

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CO₂Only

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RuBP +CO₂ +PEP

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Solution

The correct option is B RuBP +CO₂
In carboxylation, ribulose 1,5 bisphosphate (RuBP) (= Ribulose diphosphate) acts as CO₂ acceptor and 6 molecules of RuBP react with 6 molecules of CO₂ and 6 molecules of water giving rise to 12 molecules of 3 phosphoglyceric acid.

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