<P> The four photosystems absorb light energy through pigments -- primarily the chlorophylls , which are responsible for the green color of leaves . The light - dependent reactions begin in photosystem II . When a chlorophyll a molecule within the reaction center of PSII absorbs a photon , an electron in this molecule attains a higher energy level . Because this state of an electron is very unstable , the electron is transferred from one to another molecule creating a chain of redox reactions , called an electron transport chain ( ETC ) . The electron flow goes from PSII to cytochrome b6f to PSI . In PSI , the electron gets the energy from another photon . The final electron acceptor is NADP . In oxygenic photosynthesis , the first electron donor is water , creating oxygen as a waste product . In anoxygenic photosynthesis various electron donors are used . </P>
<P> The four photosystems absorb light energy through pigments -- primarily the chlorophylls , which are responsible for the green color of leaves . The light - dependent reactions begin in photosystem II . When a chlorophyll a molecule within the reaction center of PSII absorbs a photon , an electron in this molecule attains a higher energy level . Because this state of an electron is very unstable , the electron is transferred from one to another molecule creating a chain of redox reactions , called an electron transport chain ( ETC ) . The electron flow goes from PSII to cytochrome b6f to PSI . In PSI , the electron gets the energy from another photon . The final electron acceptor is NADP . In oxygenic photosynthesis , the first electron donor is water , creating oxygen as a waste product . In anoxygenic photosynthesis various electron donors are used . </P>
what are the final electron acceptors for the electron transport chains in light reactions
what are the final electron acceptors for the electron transport chains in light reactions
NADP
NADP