The first stable product formed during Calvin Cycle is _____________.

The correct answer is: 3 PGA

3 PGA is the first stable product of the Calvin cycle. During the dark phase of photosynthesis, carbon dioxide combines with RUBP in the carboxylation reaction catalyzed by enzyme RuBisCo. The carboxylation of RUBP generates 3 PGA or 3 phosphoglyceric acid which is the first stable product of dark phase.