Besides water and light which is more essential as a raw material for food formation

Besides water and light which is more essential as a raw material for food formation CO₂.
Photosynthesis is a process used by plants and other organisms for the synthesis of food. This process converts light energy into chemical energy that, through cellular respiration.
Carbon dioxide is converted into sugars in a process called carbon fixation, photosynthesis captures energy from sunlight to convert carbon dioxide into carbohydrates.