<P> By replenishing lost electrons with electrons from the splitting of water , photosystem II provides the electrons for all of photosynthesis to occur . The hydrogen ions ( protons ) generated by the oxidation of water help to create a proton gradient that is used by ATP synthase to generate ATP . The energized electrons transferred to plastoquinone are ultimately used to reduce NADP to NADPH or are used in cyclic photophosphorylation . </P>
<P> By replenishing lost electrons with electrons from the splitting of water , photosystem II provides the electrons for all of photosynthesis to occur . The hydrogen ions ( protons ) generated by the oxidation of water help to create a proton gradient that is used by ATP synthase to generate ATP . The energized electrons transferred to plastoquinone are ultimately used to reduce NADP to NADPH or are used in cyclic photophosphorylation . </P>
where do the electrons needed by photosystem two originate
where do the electrons needed by photosystem two originate
from the splitting of water
from the splitting of water