When a compound is cleaved, free oxygen is released during photosynthesis.

Photosynthesis is a multi-step process that takes place in all green plants on our planet. Plants have chloroplasts in their cells. It is they who take a direct role in the biochemical reaction. If we explain photosynthesis in a simple way, then we can say that this is the process of absorption of carbon dioxide and water by the surface of a plant using the root system. Only under the influence of sunlight is glucose formed, which serves as a source of energy for the plant. Oxygen is released as a by-product of the reaction, since water has oxygenium in its molecule.