Question

which compound is produced during carbon fixation?
pga
g3p
rubp
c₆h₁₂o₆

Explanation:

In the Calvin cycle (carbon fixation in photosynthesis), carbon dioxide combines with RuBP (ribulose - 1,5 - bisphosphate) to form an unstable 6 - carbon compound which immediately splits into two 3 - carbon compounds called 3 - phosphoglycerate (PGA). G3P (glyceraldehyde - 3 - phosphate) is produced later in the reduction phase. RuBP is the starting molecule for carbon fixation, not a product of the fixation step. Glucose ($\ce{C6H12O6}$) is produced much later after multiple cycles and reactions. So the compound produced during carbon fixation is PGA.

Answer:

A. PGA