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Photosynthesis In Higher Plants
The 1st CO2 fixation product of C4 plant is
Oxaloacetic acid
ribulose biphosphate
phosphoenolpyruvate
phosphoglyceric acid.
A.
Oxaloacetic acid
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.
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