Question
Biology Question on Photosynthesis in higher plants
The first carbon dioxide fixation product of C plants is
A
oxaloacetic acid
B
ribulose biphosphate
C
phosphoenol pyruvate
D
phosphoglyceric acid
Answer
oxaloacetic acid
Explanation
Solution
In C plants, initial fixation of carbon dioxide occurs in mesophyll cells. The primary acceptor of CO i.e., phosphoenol pyruvate (PEP) combines with CO in the presence of PEP carboxylase or PEPcase to form oxaloacetic acid, which is the first stable carbon dioxide fixation product in C pathway.