Solution :
Photosynthesis is a physico-chemical process by which green plants use light energy to drive the synthesis of organic compounds. It is an enzyme regulated anabolic process.
Photosynthesis is the basis of life on earth because it is the primary source of all food on earth and it is responsible for release of in the atmosphere.
Chlorophyll, light and is required for photosynthesis. It occurs only in green part of leaves and in presence of light.