Question

Which of the following is the primary product formed during $C{O}_2$ fixation in the $C_4$ pathway?

• A. Ribulose-1,5-bisphosphate
• B. Oxaloacetic acid
• C. Phosphoglycerate
• D. Phosphoenolpyruvate

Answer 1

The correct option is B Oxaloacetic acid

Oxaloacetic acid is the primary $C{O}_2$ fixation product in the $C_4$ pathway.

Ribulose-1,5-bisphosphate is the primary $C{O}_2$ acceptor in the Calvin cycle.

Phosphoglycerate is the primary fixation product in the Calvin cycle.

Phosphoenolpyruvate is the primary $C{O}_2$ acceptor in the $C_4$ cycle.