The CO2 acceptors of C4cycle are
Oxaloacetic acid and Phosphoenol pyruvic acids
Ribulose 1,5 -bis phosphate and Phosphoenol pyruvic acid
Ribulose 1,5 bisphosphate and Pyruvic acid
Aspertic acid and Phosphoenol puruvic acid
In C4 cycle the primary CO2 acceptor is present in the mesophyll cell as Phospho enol pyruvic acid and the secondary CO2 acceptor is Ribulose 1, 5 -bisphospyate.