The word photosynthesis is a combination of the two Greek words photos (meaning: light; here sunlight) and synthesis (meaning: synthesis, or making). Analyzing the word photosynthesis again, it is seen that the word light means - the presence of sunlight and the word synthesis means - the production of something. In a word, photosynthesis means chemical synthesis in the presence of sunlight. Biochemical processes in green plant cells in the presence of sunlight, the reaction of carbon dioxide (CO2) taken from the environment and water absorbed by the roots, the synthesis of carbohydrates , Call it photosynthesis. In this process, the pigment called chlorophyll present in living plant cells converts the light energy into chemical energy and stores it in the form of stagnant energy in the sugary food produced. This energy is subsequently assisted by carnivorous plants or in the secondary nutrition of vegetarian animals. Apart from green plants, this process is also observed in some germs and some protozoa. In the process of physiological oxidation, in the presence of sunlight in living cells (plants) with some germs, protozoa and chlorophyll, the chemical reaction of carbon dioxide taken from the environment and the water absorbed by the root hairs produces simple sugars and produces carbon dioxide. When bound, it or that process is called photosynthesis.