During the light-dependent reactions of photosynthesis, water is split in PSII, and oxygen is released. High-energy electrons are then transferred from PSII to PSI through an electron transport chain. This transfer allows for the production of NADPH and ATP.
The light-dependent reactions of photosynthesis constitute two photosystems, PSII and PSI, connected by an electron transfer pathway. In PSII, water is split, and oxygen is released as a byproduct.
The high-energy electrons from PSII are then passed through an electron transport chain to PSI, where they are used to produce NADPH.
This electron transfer pathway allows for the generation of ATP and the formation of NADPH, which are key molecules in the light-dependent reactions.