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Q.
The first product of $CO_2$ fixation in $C_4$ plants is
Photosynthesis in Higher Plants
Solution:
In $C _{4}$ plants initial fixation of $CO _{2}$ occurs in mesophyll cells. It produces oxaloacetic acid as the first stable product of $CO _{2}$ fixation; while phosphoglyceraldehyde (PGA) is the first product of $CO _{2}$ fixation in $C _{3}$ plants.