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Question
Biology
The first carbon dioxide fixation in C4 pathway occurs in chloroplasts of
Q. The first carbon dioxide fixation in
C
4
pathway occurs in chloroplasts of
2733
168
WBJEE
WBJEE 2008
Photosynthesis in Higher Plants
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A
guard cells
3%
B
mesophyll cells
70%
C
bundle sheath cells
25%
D
epidermal cells
2%
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.