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Question

Primary acceptor of CO2 in photosynthesis is

A
Phosphoric acid
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B
Ribulose phosphate
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C
Glucose
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D
Ribulose-1, 5-biphosphate
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Solution

The correct option is D Ribulose-1, 5-biphosphate
The primary carbon dioxide acceptor in the dark reaction is Ribulose 1,5 bisphosphate or RUBP, which is carboxylated by the enzyme Ribulose 1,5 bisphosphate carboxylase oxygenase or RuBisCo. As a result of this carboxylation, two molecules of three carbon atom compound phosphoglyceric acid are produced as the first stable product of C3 cycle.

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