Question

Which process is catalyzed by rubisco during the light-independent reactions of photosynthesis?

Answer 1

RuBisCO enzyme catalyzes the carboxylation of ribulose-1,5-bisphosphate during the CO2 fixation in the first stage of light-independent reactions.

The light-independent reactions are the second stage of photosynthesis, also called dark reactions because they are not directly driven by light. These reactions convert carbon dioxide (CO2) and other compounds into glucose. 
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Answer 2

Answer:

The correct is the carboxylation process.

Explanation:

Rubisco or ribulose-1,5-bisphosphate carboxylase/oxygenase is the major enzyme of the calvin cycle. It is responsible for the fixation of carbon dioxide in plants into energy-rich molecules by initiating the Calvin cycle. The chlorophyll captured solar light at the origin of the processes of photosynthesis. RuBP or rubisco catalyzes both carboxylation and oxidation of ribulose-1,5-bisphosphate.

Thus, the correct answer is the carboxylation process.