What is photosynthesis? What role did his appearance play in the development of life on earth?

Photosynthesis is a complex process in the life of plants and some microorganisms that contain photosynthesizing pigment. It consists of two phases – light and dark. In the light phase of photosynthesis, electrons of a certain length are knocked out of chlorophyll of chloroplasts (special types of plastids – two-membrane organelles of a plant cell), which are necessary for a number of processes: photophosphorylation (conversion of ADP into ATP, which contains energy), photolysis of water (decay of H2O into OH ), accumulation of NADP (biocatalyst), hydrogen atoms (H) and carbon dioxide (CO2). The used electron is returned to chlorophyll. The dark phase begins, in which everything that was stored in the light stage is used in the Calvin cycle, in which, after complex biochemical reactions, the plant receives glucose (C6H16O6), which is the food of the green creature. The Earth’s atmosphere has not always been the same as it is now. In times immemorial, the air of the planet did not contain oxygen – it was alien to the primitive living creatures that lived on Earth and was a strong oxidizer that killed in moments. It appeared in the process of photosynthesis of the first green organisms as a side effect, but it became so abundant that it densely entered the atmosphere. They began to adapt to oxygen, as a result, almost all living organisms on the Earth use it in various processes. Now oxygen is an integral part of breathing creatures. Plants contribute to maintaining the oxygen concentration in the atmosphere, which is vital for the living organisms of the planet.