Photosynthesis is the process of the formation of organic compounds from inorganic ones due to the energy of sunlight.
Light and dark phases of photosynthesis are distinguished.
During the light reactions of photosynthesis, the energy of light is accumulated in the macroergic bonds of ATP molecules and then used for the synthesis of glucose in the dark phase.
In addition, under the influence of light quanta and in the interaction with chlorophyll, the decomposition (photolysis) of water occurs. The result is atomic hydrogen H and OH free radicals. OH radicals interact with each other, forming free oxygen and water. Since oxygen is not included in a further cascade of photosynthesis reactions, it is released into the external environment.
(In the dark of photosynthesis, glucose is formed from carbon dioxide and hydrogen H with the expenditure of ATP energy.)
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