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  4. In C4 plants synthesis of sugars/final CO2 fixation occurs in :

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Q. In $C_{4}$ plants synthesis of sugars/final $CO_{2}$ fixation occurs in :

J & K CETJ & K CET 2004Photosynthesis in Higher Plants

Solution:

In mesophyll cells of $C_{4}$ plants $CO _{2}$ combines with PEP to form oxalo acetic acid. The oxaloacetic acid by transamination converted to aspartic acid or may reduced to malic acid. The malic acid transported to bundle sheath cell and converted to pyruvic acid and $CO _{2}$. The $CO _{2}$ released in bundle sheath cell is fixed by Calvin cycle in bundle sheath cell (final $CO _{2}$ fixation).