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  4. The first carbon dioxide fixation product of C4 plants is

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Q. The first carbon dioxide fixation product of C4 plants is

AIIMSAIIMS 2015Photosynthesis in Higher Plants

Solution:

In C4 plants, initial fixation of carbon dioxide occurs in mesophyll cells. The primary acceptor of CO2 i.e., phosphoenol pyruvate (PEP) combines with CO2 in the presence of PEP carboxylase or PEPcase to form oxaloacetic acid, which is the first stable carbon dioxide fixation product in C4 pathway.