Final answer:
The process in which electrons move from water through PSII and PSI to NADPH is known as non-cyclic photophosphorylation.
Step-by-step explanation:
The process in which electrons move from water through PSII and PSI and ultimately to NADPH is known as non-cyclic photophosphorylation. In this process, light excites electrons in PSII, which are then captured by an electron acceptor and transferred through an electron transport chain to PSI.
From PSI, high-energy electrons are transferred to NADP+ to form NADPH. Along the way, protons are pumped across the thylakoid membrane, creating a proton gradient that is used to synthesize ATP through ATP synthase.