The first stable product of carbon fixation in C₃ photosynthesis is
A) CO₂ .
B) a three-carbon compound called phosphoglyceric acid.
C) citric acid.
D) glyceraldehyde 3-phosphate.

Question

Quizplus · Accepted Answer

The first stable product of carbon fixation in C₃ photosynthesis is a three-carbon compound called phosphoglyceric acid (PGA). This occurs when CO₂ combines with a five-carbon sugar called ribulose-1,5-bisphosphate (RuBP) to form two molecules of PGA.

The First Stable Product of Carbon Fixation in C₃ Photosynthesis