is photosynthesis: in the lithosphere, the atmosphere, the biosphere or hydrosphere

Answer 1

Photosynthesis primarily occurs in the biosphere. It is the process by which green plants, algae, and some bacteria convert light energy, usually from the sun, into chemical energy stored in glucose, using carbon dioxide (from the atmosphere) and water (from the hydrosphere). While the substrates (like CO2 and water) necessary for photosynthesis can come from other spheres, the actual process itself takes place in living organisms within the biosphere.