Question

O2 liberated during photosynthesis come from

Answer 1

O2 liberated during photosynthesis come from photolysis

Answer 2

Hey mate here is your answer,

During photosynthesis carbondioxide(CO2) and Water ( H2O) is taken.

O2 or Oxygen is liberated from the oxygen present in H2O i.e. water.

Exchange of gases takes place in Stomata of leaves so O2 comes out from it only.

Hope it helps you friend☺☺☺