The two processes are known as the light reactions and the Calvin Cylce.
Solar energy is absorbed by chlorophyll.
Each have a different reaction center, a particular kind of primary electron acceptor next to chlorophyll a molecule associated with specific proteins. The reaction - center chlorophyll of photosystem I is known as p700 because it absorbs light having a wavelength of 700nm. Likewise, the reaction - center chlorophyll of photosystem II is called p680 because it absorbs light having a wavelength of 680nm. Light drives the synthesisThe flow of electrons through the photosystems and other molecular components built into the thylakoid membrane is the key to the energy transformation. When photosystem II absorbs light, electrons and excited electron is captured by the primary electron acceptor.