Principle objective of this lecture is to present on Photosynthesis. Here also present on where does photosynthesis occur. Photosynthesis is a process by which green plants use sunlight trapped by chlorophyll to produce organic compounds (carbodyrate) from carbon dioxide and water, oxygen is released as by-product. The little light that does make it here is enough for the plants of the world to survive and go through the process of photosynthesis. Finally explain on Summary and experiment of Photosynthesis.