What is the CO₂ acceptor during the dark reaction of C3 photosynthesis?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
The CO₂ acceptor in the dark reaction (Calvin cycle) of C3 photosynthesis is Ribulose-1,5-bisphosphate (RuBP), a five-carbon sugar molecule. During carbon fixation, the enzyme RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase) catalyzes the attachment of CO₂ to RuBP, forming an unstable six-carbon intermediate that immediately splits into two molecules of 3-phosphoglycerate (3-PGA), a three-carbon compound. This is the first stable product of C3 photosynthesis, which is why these plants are called C3 plants. RuBP must be continuously regenerated through the Calvin cycle to sustain ongoing carbon fixation and glucose production.
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