Question

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

• A. Both statements $1$ and $2$ are correct
• B. Statement $1$ is correct but statement $2$ is incorrect
• C. Statement $1$ is incorrect but statement $2$ is correct
• D. Both statements $1$ and $2$ are incorrect

Answer 1

Answer: (A)

Both statements $1$ and $2$ are correct

Answer 2

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.