The aim of this lecture is to present on experiment of Photosynthesis. Here briefly focus to show that light is necessary for Photosynthesis. Here explain four steps: Boil the leaf in water, Boil the leaf in alcohol, Wash the leaf in warm water and Add iodine solution to the leaf, what is the expected result. Plants make food using photosynthesis. This needs light, carbon dioxide and water. It produces glucose, and oxygen as a by-product. Leaves are adapted to carry out photosynthesis.