The main primary energy source of photosynthesis is the
sun,which is the unique and central part of our solar
system.
During photosynthesis,solar energy is transformed into chemical
energy,the energy of the chemical bonds of the produced glucose
molecules and of the molecular oxygen released.
The energy of glucose is then stored as starch or it is used in
the cellular respiration process and transferred to ATP
molecules.
ATP is consumed during metabolic processes that require
energy.