Photosynthesis Question 87
87. The enzyme that catalyses carbon dioxide fixation in $C_4$ plants is
[1992]
(a) RuBP carboxylase
(b) PEP carboxylase
(c) Carbonic anhydrase
(d) Carboxy dismutase
Show Answer
Answer : b
Hints & Solution
(b) In $C_4$ plants, the primary acceptor of $CO_2$ is phosphoenol pyruvate. It combines with carbon dioxide in the presence of PEP carboxylase to form oxaloacetic acid in mesophyll cells.
