Photosynthesis produces both glucose (sugar) and oxygen as products in the chemical reaction. Plants use photosynthesis to take in sunlight, water, and carbon dioxide as reactants and produce glucose for energy and oxygen. The reactants for photosynthesis are light energy, water, carbon dioxide and chlorophyll , while the products are glucose (sugar), oxygen and water.
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Considering the definition of photosynthesis, oxygen is not a reactant needed for photosynthesis.
But first it is neccesary to know that photosynthesis is a metabolic process carried out by certain cells of autotrophic organisms, that is, those that have the capacity to make their own food, such as plants.
Taking as examples plants, first water and minerals are absorbed from the environment, generally through their roots, then the absorbed nutrients circulate through the plant to the leaves, which is where photosynthesis will almost always take place.
For the photosynthesis of plants to take place, the presence of chlorophyll is necessary, a pigment that is sensitive to sunlight and is the one that gives plants their characteristic green color.
Chlorophyll has the ability to absorb energy from sunlight and transfer it to the production (synthesis) of carbohydrates from two compounds available in the medium: water (H₂O) and carbon dioxide (CO₂) (captured from the environment).
This photochemical process also produces oxygen (O₂) that is released into the atmosphere.
Finally, synthesized organic molecules can be used as a source of chemical energy to support vital processes such as cellular respiration and metabolism.
Then, sunlight, carbon dioxide and water are needed for the photosyntesis, while oxygen is released to the environment.
This is sunlight, carbon dioxide and water are reactants needed for photosyntesis, and oxygen is not a reactant needed.
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