How Does Carbon Fixation Differ Between C₃ and C₄ plants

How does carbon fixation differ between C₃ and C₄ plants?

A) C₄ plants undergo carbon fixation by carboxylation of a four- carbon substrate oxaloacetate) , while in C₃ plants, a three- carbon compound phosphoglycerate) is carboxylated.
B) C₃ plants don't undergo photorespiration, but C₄ plants do.
C) Both C₃ and C₄ plants involve carboxylation of ribulose- 1,5- bisphosphate by rubisco; but in C₃, the first stable intermediate is 3- phosphoglycerate, and in C₄, it is oxaloacetate.
D) Rubisco is the primary enzyme that catalyzes carbon fixation in C₃ plants, and phosphoenolpyruvate carboxylase can catalyze carbon fixation in C₄ plants.

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