Question

First stable product of Calvin cycle has

• A. 2 carbon atoms
• B. 3 carbon atoms
• C. 4 carbon atoms
• D. 6 carbon atoms

Answer 1

The correct option is B 3 carbon atoms

PGA (Phospho Glyceric Acid) is the first stable compound formed in $C_3$ cycle. It is formed by the reaction of RUBP and $C{O}_2$, to produces a six carbon intermediate that splits into 2 molecules of 3-carbon compound.

So, the correct answer is '3 carbon atoms'