The molecule in the C₄ pathway that first combines with carbon dioxide is

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phosphoenol pyruvic acid

ribulose biphosphate

citric acid

glyceraldehyde phosphate

answer is C.

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Detailed Solution

In C₄ plants the primary CO₂ acceptor is a 3- carbon molecule phosphoenol pyruvate (PEP) and is present in the mesophyll cell. The enzyme responsible for this fixation of PEP carboxylase. It is important that the mesophyll cells lack RuBisCO enzyme. C₄ acid OAA is formed in the mesophyll cells.

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