Photosynthesis is the process by
which some organisms, primarily plants, convert light energy into energy
that can be used for biological functions. The end result of
photosynthesis is hydrogen. This process can be broken up into two
different parts: photolysis and the Calvin cycle. The expenditure and
usage of carbon from the environment occurs during the Calvin cycle,
which is why it is also known as the carbon fixation stage. This occurs
after photolysis has already taken place.
Carbon fixation covers several different biological functions
necessary for the finalization of photosynthesis. This includes the
entry of carbon into the cycle, the breaking down of a newly formed but
unstable compound, the breaking down of glycerate phosphate and the
creation of triose phosphate. This process requires energy, which is
obtained from light sources during the photolysis stage, so it occurs
after the plant has already absorbed an adequate amount of energy from
environmental light sources
