Schematic of photosynthesis in plants. The carbohydrates produced are stored in or used by the plant.

Since water is used as the electron donor in oxygenic photosynthesis, the equation for this process is:

The cyclic reaction is similar to that of the non-cyclic but differs in that it generates only ATP, and no reduced NADP (NADPH) is created. The cyclic reaction takes place only at photosystem I. Once the electron is displaced from the photosystem, the electron is passed down the electron acceptor molecules and returns to photosystem I, from where it was emitted, hence the name cyclic reaction.

Although some of the steps in photosynthesis are still not completely understood, the overall photosynthetic equation has been known since the 19th century.

synthesis of complex carbon compounds out of carbonic acid, in the presence of chlorophyll, under the influence of light

The radiation climate within plant communities is extremely variable, in both time and space.

RuBisCO oxygenase activity is disadvantageous to plants for several reasons:

The salvaging pathway for the products of RuBisCO oxygenase activity is more commonly known as photorespiration, since it is characterized by light-dependent oxygen consumption and the release of carbon dioxide.