Q. In $C_{3}$-plants, the first stable compound formed after carbon dioxide fixation is
A) Phosphoglyceraldehyde
B) Malic acid
C) Oxaloacetic acid
D) 3-phosphoglycerate
Explanation
The first step or Calvin Cycle or $C_{3}$-pathway is Carboxylation in which a 5 C sugar RuBP acts as carbon dioxide acceptor in the presence of enzyme RUBISCO and produces 6C unstable compound. This unstable 6C compound splits into molecules of 3-phosphoglyceric acid (3C-compound), which is the first stable product of this pathway.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.