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The carbon dioxide acceptor in Calvin cycle/ C3-plants is

1. Phospho-enol pyruvate (PEP)
2. Ribulose 1, 5-diphosphate (RuBP)
3. Phosphoglyceric acid (PGA)
4. Ribulose monophosphate (RMP)

Correct answer: Ribulose 1, 5-diphosphate (RuBP)

Solution

In the Calvin cycle, CO2 is fixed by the enzyme RuBisCO onto ribulose 1,5-bisphosphate (RuBP), a 5-carbon acceptor molecule. This produces an unstable 6-carbon intermediate that quickly splits into two molecules of PGA.

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