In dark reaction,the first reaction is

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(A) The first step of the dark reaction (Calvin cycle) is carboxylation.In this process,$CO_2$ is fixed by the enzyme $RuBisCO$ (Ribulose$-1,5-$bispho

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Carboxylation

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(A) The first step of the dark reaction (Calvin cycle) is carboxylation.In this process,$CO_2$ is fixed by the enzyme $RuBisCO$ (Ribulose$-1,5-$bisphosphate carboxylase-oxygenase) to a $5$-carbon sugar called Ribulose-$1,5$-bisphosphate $(RuBP)$.This reaction results in the formation of two molecules of $3$-phosphoglyceric acid ($3$-$PGA$).The reaction is represented as:$6$ Ribulose-$1,5$-bisphosphate + $6$ $CO_2$ + $6$ $H_2O$ $\xrightarrow{RuBisCO}$ $12$ molecules of $3$-phosphoglyceric acid.

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