Question

Which is the primary CO 2 fixation product in C4 plants?

• A. OAA
• B. PEP
• C. PGA
• D. RuBP

Answer 1

Answer:

A. OAA

• Phosphoenolpyruvate (PEP) is the 3-Carbon compound and acts as the primary CO2 acceptor in the mesophyll cells of C4 plants, leading to the formation of OAA (Oxaloacetic acid), C4 acid.

• The enzyme PEP carboxylase or PEPcase catalyses this reaction.