Directions: Arrange in sequence the process of electron flow in photosystems from first to last by writing 1 - 4 on the blank provided before each number. PHOTOSYSTEM II A Energy lost reduces ADP - . B. Light energy is trapped and boosts electron to a higher level. C. The electrons are passed from one acceptor (plastoquinone and cytochrome) to the next to photosystem I. D. The electrons are received by an electron acceptor PHOTOSYSTEMI A. The electrons from photosystem II lost energy when they pumped H+ across the membrane. B. It produces NADPH to be used on the next set of reactions. C. The light gives electrons energy again combines with proton from the split water to reduce NADP. D. It goes through electron transport chain (ETC)