(c) : During photosynthesis a portion of light energy absorbed by chlorophyll and carotenoids is eventually stored as chemical energy via the formation of chemical bonds. This conversion of energy from one form to another is a complex process that depends on cooperation between many pigment molecules and a group of electron transfer proteins. The majority of pigments serve as an antenna complex, collecting light and transfusing energy to the reaction center complex. There are two photochemical complexes, known as photosystem I and II. PSII absorbs far red light of wavelengths greater than 680 nm and PSI absorbs red light of wavelengths greater than 700 nm. Both these complexes are involved in light reactions of photosynthesis.