Photosynthesis is the important function takes place mostly in green plants which converts inorganic compounds, water, carbon dioxide to the glucose or organic compound in presence of light energy. It is an important reaction that is required for energy and for food for almost every organism.
Carbon dioxide is the carbon source for the plants to produce glucose or simple sugars with help of water and light energy.
Fossil fuels are formed by the process of decomposition of organic compound and organism of the prehistoric organism which is a carbon containing energy source.
Breaking down or catabolism of glucose in order to produce energy in the form of the ATP is called cellular respiration which is essential for cell to perform cellular functions.
