Question
In C4 plants, CO2 combines with
phosphoglyceric acid
ribulose diphosphate
phosphoenol pyruvate
phosphoglyceraldehyde
Solution
C.
phosphoenol pyruvate
In C4 plants, CO2 is picked up by a 3-carbon compound Phosphoenol pyruvate (PEP) to form 4-carbon compound Oxaloacetic acid. This reaction is catalysed by PEP carboxylase and it takes place in the cytoplasm of mesophyll cells.
