Where does photosynthesis occur in the biosphere and geosphere?

Photosynthesis occurs in the biOSphere, specifically in the chloroplasts of plants and algae. These organisms use sunlight, water, and carbon dioxide to produce glucose and oxygen. The geosphere, which includes the Earth's crust, does not play a direct role in photosynthesis, but it does provide the materials needed for this process to occur, such as sunlight and water.