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Q. $PEP$ is primary $CO_{2 }$acceptor in

Photosynthesis in Higher Plants

Solution:

In $C_{4}$ plants, initial fixation of $CO_{2}$ or carboxylation occurs in mesophyll cells. The chloroplasts of mesophyll cells possess enzyme $PEP$ carboxylase (or $PEP$ case) for initial fixation of $CO_{2}$. The primary acceptor of $CO_{2}$ is phosphoenol pyruvate or $PEP$. It combines with $CO_{2}$ in the presence of $PEP$ carboxylase (or $PEP$case) to form oxaloacetic acid or oxaloacetate $(OAA)$.