Photosynthesis, which is the process through which some living organisms, including most plants and some fungi, make their own food, produces oxygen as a waste product.<span> The process of photosynthesis in plants is the reverse of the respiration process in humans. While humans breathe in oxygen and expel carbon dioxide, plants ingest carbon dioxide and dispel oxygen.</span>
Photosynthesis is the chemical process by which plants make glucose and oxygen from carbon dioxide and water mixed with light energy. The plants use glucose while the oxygen is considered a waste product for them.
