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Photosynthesis in Higher Plants
The first carbon dioxide fixation in C4 pathway occurs in chloroplasts of
guard cells
mesophyll cells
bundle sheath cells
epidermal cells
B.
mesophyll cells
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In C4 plants, initial CO2 fixation occurs in mesophyll cells. The primary acceptor of CO2 is phosphoenol pyruvate (PEP). It combines with carbon dioxide in presence of PEP carboxylase to form oxaloacetic acid.
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