Question

Primary carboxylation occurs in $C_3$ and $C_4$ plants with the help of

• A. PEP carboxylase and pyruvate carboxylase
• B. PEP carboxylase and RuBP carboxylase
• C. RuBP carboxylase and PEP carboxylase
• D. RuBP carboxylase and pyruvate carboxylase.

Answer 1

The correct option is C RuBP carboxylase and PEP carboxylase

• Primary carboxylation in $C_3$ plants is done by RuBP in the presence of enzyme RuBP carboxylase.
  
• In $C_4$ plants, it is done by the PEP molecule with the help of PEP carboxylase.

So the correct option is 'RuBP carboxylase and PEP carboxylase'.