Photosynthesis is the process by which green plants and certain other organisms transform light energy into the chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water,carbon dioxide, and minerals into oxygen and energy- rich organic compounds.
Photosynthesis also applies to other organisms besides green plants. These include several prokaryotes such as cyanobacteria, purple bacteria and green sulfur bacteria. These organisms exhibit photosynthesis just like green plants. The glucose produced during photosynthesis is then used to fuel various cellular activities. The by - product of this physio-chemical process is oxygen.
The Reaction of photosynthesis is
Carbon dioxide + Water ------> Glucose + Oxygen