What Are The Reactants Of Photosynthesis?Carbon Dioxide And Hydrogenhydrogen, Oxygen, And Waterlight Energy, Water, And Carbon Dioxideoxygen And Glucose. The primary reactants of the photosynthesis reaction are carbon dioxide and water. In the presence of sunlight, plants absorb carbon dioxide from the air through tiny openings in their.

The reactants include six carbon dioxide molecules, each with one carbon atom (6co2) while the products contain one glucose molecule with six carbon atoms c6h12o6. In the presence of sunlight, plants absorb carbon dioxide from the air through tiny openings in their. Absorbed by the roots from the soil,.