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  4. The first carbon dioxide fixation in C4 pathway occurs in chloroplasts of

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Q. The first carbon dioxide fixation in $ {{C}_{4}} $ pathway occurs in chloroplasts of

WBJEEWBJEE 2008Photosynthesis in Higher Plants

Solution:

In $ {{C}_{4}} $ plants, initial $ C{{O}_{2}} $ Fixation occurs in mesophyll cells. The primary acceptor of $ C{{O}_{2}} $ is phosphoenol pyruvate (PEP). It combines with carbon dioxide in presence of PEP carboxylase to form oxaloacetic acid.