What is photosynthesis waste product?

The waste product of photosynthesis is oxygen, which is released into the atmosphere. During photosynthesis, carbon dioxide is taken in and water is split, and as a result, oxygen is produced as a byproduct. This oxygen is essential for the survival of animals and other organisms that rely on it for respiration. The process of photosynthesis is therefore vital not only to plants but to all living things on earth. In fact, the amount of oxygen produced by photosynthesis is estimated to be around 50-85% of the total oxygen present in the atmosphere.