Where Do the Oxygen Molecules Come from in the O₂

Question

Where do the oxygen molecules come from in the O₂ produced by photosynthesis?
A)water
B)glucose
C)air
D)electrons from NADPH
E)CO₂

Accepted Answer

Oxygen molecules in O₂ produced by photosynthesis come from water molecules. During the light-dependent reactions of photosynthesis, water is split into oxygen, hydrogen ions, and electrons. The oxygen atoms combine to form O₂, which is released as a byproduct.