Expand the abbreviation RuBP. What is its role in photosynthesis?

Full form of RuBP is Ribulose 1,5 biphosphate. RuBP is the first acceptor of atmospheric C02 during dark
reaction of photosynthesis. The reaction is called carboxylation.

6RuBP + 6Co2 + 6H2o ------» Unstable 6C compound ------> 3PGA

RuBP is regenerated during final formation of sugar molecule.