Name the two important enzymes of `C_(3)` and `C_(4)` pathway, respectively. What important role do they play in fixing `CO_(2)` ?

Explanation

The important enzymes of `C_(3)` cycle is RuBP carboxylase oxygenase which catalyses reaction of carboxylation of ribulose bis-phosphate, which is 5- carbon compound to form PGA, the first stable product in `C_(3)` cycle.
In `C_(4)` cycle, the important enzyme is phosphoenol pyruvate carboxylase (PEP carboxylase ) which help in fixing `CO_(2)` to form oxaloecetate (4-carbon compound ) the first stable product of dark reaction is `C_(4)` cycle.