The process of photosynthesis plays an important role in plants preparing food through photosynthesis. Plants, in turn, are eaten by animals. Photosynthesis converts radiation or solar energy into chemical energy. The productivity of crops is directly related to the rate of photosynthesis. It provides oxygen to all living organisms in the atmosphere. It balances the ecosystem with oxygen and carbon dioxide. Fossil fuels come from plants. The energy stored in the fuel is first captured by the sun, leading to photosynthesis.