What is photosynthesis?

The chloroplast inside the green leaves of plants is the 'workshop' where photosynthesis takes place. Water (H,O) is supplied to the leaves by the roots, and carbon dioxide (CO,) is absorbed from the air through tiny pores on the lower side of the leaf. Both these are broken down into the elements hydrogen (H), carbon (C), and oxygen (0) with the help of chlorophyll and sunlight. Plants build 'glucose' (grape sugar) from these elements and oxygen is released in the atmosphere as a by-product. Photosynthesis has been the source of oxygen in the air since the origin of life on the Earth. 

During photosynthesis, carbon dioxide and water are broken down with the help of the sun's energy. The end products of this process react together to form glucose (grape sugar) and oxygen. Glucose is stored in the plant and oxygen is released in the atmosphere, through tiny openings in the leaf.