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Phosphoenol pyruvate (PEP) is the primary $CO_2$ acceptor in:
Explanation
PEP carboxylase fixes $CO_2$ in $C_4$ mesophyll.
Detailed Solution
PEP is a 3C compound which serves as the primary $CO_2$ acceptor in the mesophyll cell cytoplasm of $C_4$ plants like maize, sugarcane and $Sorghum$.