How Does Carbon Fixation Differ Between C₃ and C₄ Plants

question 29

Multiple Choice

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)Both C₃ and C₄ plants involve carboxylation of ribulose-1,5-bisphosphate by rubisco;but in C₃ plants,the first stable intermediate is 3-phosphoglycerate,and in C₄ plants,it is oxaloacetate.
• C)C₃ plants don't undergo photorespiration,but C₄ plants do.
• 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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