Like all other organisms, green plants use carbohydrates and other oxidised organic substances as an energy source; however unlike the majority of organisms green plants - avtotrofy (' eating independently '). Plants create the food, transforming a chemical way atmospheric dioxide of carbon (С02) in sugar and related it connections at the expense of the radiant energy absorbed by the photosynthetic device hloroplastov. Thus, plants play to the nature a role of primary producers of organic substances; differently, they do not require receipt of organic substances from the outside.

The Part of sugars formed in the course of photosynthesis almost immediately turns in vysokopolimernoe connection - the starch reserved in the form of starched grains in hloroplastah and lejkoplastah; simultaneously other part of sugars: it is deduced from plastid and moves in a plant to any other places. The sugar transformed into starch, thereby for a while is withdrawn from further metabolic, transformations, however starch can be split again yes sugar which easily is oxidised and thus provides a cage with necessary energy. We will devote this chapter to consideration of mechanisms with which help in a plant from С02 and Н2О are synthesised sugar.

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