The enzyme used in $C O_{2}$ fixation in mesophyll cells of C4 plants:

RuBisCO

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Malate dehydrogenase

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Pyruvate kinase

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PEP carboxylase

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Solution

The correct option is D PEP carboxylase
The primary $C O_{2}$ acceptor in C4 plants is a 3-carbon molecule phosphoenol pyruvate (PEP). The enzyme responsible for this fixation is PEP carboxylase.

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