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  4. Read the given statements and select the correct option. Statement 1: Carboxylation is the most crucial step of Calvin cycle where CO2 is utilised for the carboxylation of RuBP. Statement 2: Carboxylation is catalysed by the enzyme RuBisCO which results in the formation of two molecules of 3PGA.

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Q. Read the given statements and select the correct option.
Statement 1 : Carboxylation is the most crucial step of Calvin cycle where $CO_{2}$ is utilised for the carboxylation of $RuBP$.
Statement 2: Carboxylation is catalysed by the enzyme $RuBisCO$ which results in the formation of two molecules of $3PGA$.

Photosynthesis in Higher Plants

Solution:

Carboxylation is the fixation of $CO_{2}$ into a stable organic intermediate. It is the most crucial step of Calvin cycle where $CO_{2}$ is utilised for the carboxylation of $RuBP$ through the use of $ATP$ and $NADPH$ generated by the light reactions. This reaction is catalysed by enzyme $RuBisCO$ which results in the formation of two molecules of $3$-phosphoglyceric acid or $PGA$, which is the first stable product of photosynthesis.