Final answer:
Oxygen is produced during the light-dependent reactions of photosynthesis.
Step-by-step explanation:
During photosynthesis, oxygen is produced during the light-dependent reactions.
In these reactions, chlorophyll absorbs light energy and uses it to split water molecules, releasing oxygen as a byproduct.
The overall equation for photosynthesis is:
Energy + 6CO₂ + H₂O → C6H₁2O6 +602, which shows that water is oxidized to produce oxygen.