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Question
During dark reaction for fixation of carbon, the three carbon atoms of each molecule of 3 phosphoglyceric acid (PGA) are derived from
Options:
A .  RuBP only
B .  RuBP +CO2
C .  CO2 Only
D .  RuBP +CO2  +PEP
Answer: Option B
:
B
In carboxylation, ribulose 1,5 bisphosphate (RuBP) (= Ribulose diphosphate) acts asCO2 acceptor and 6 molecules of RuBP react with 6 molecules of CO2and 6 molecules of water giving rise to 12 molecules of 3 phosphoglyceric acid.

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