Question

electron passed out by psll are replaced from
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Answer 1

elecrons from the first transport chain

Answer 2

Electron passed out by psll are replaced from  water

• Photosystem II reaction is the centre P during the light reactions of photosynthesis.  To raise its electrons, light absorbs and reaches an oxidised state.
• The electron source is water in green plants and cyanobacteria to minimise the oxidised chlorophyll molecules. By this sort of electron flow, NADPH is synthesised.
• From the PS II, electrons are transferred and then passed on to the PS I pigments. Electrons are then excited and transferred to another acceptor. Then these electrons are transferred downhill again to a NADP molecule.
• The mobile electron emitted by P from psII must be carefully replaced, which is accessible by electrons due to water bifurcation. PsII, situated on the thylakoid membrane, is already related to the water bifurcation complex.