water
water
water
During non-cyclic electron flow, electrons come from water molecules that are split by photosystem II. These electrons replace the ones lost by photosystem II as they are passed along the electron transport chain.
Photosystem I
The electrons that are passed to NADPH during noncyclic photophosphorylation were obtained from water. The ultimate electron and hydrogen acceptor in the noncyclic pathway is NADPH+.
they move through an electron transport chain to photosystem 1
From energy in photons
Excited electrons are transferred to an electron transport chain.
Excited electrons are transferred to an electron transport chain.
in non-cyclic the electrons do not return the source and the cyclic the electrons come back to the source. Mostly the non-cyclic process occurs to produce ATP AND NADH which will be used by the Calvin cycle to produce the carbohydrate but some times there occurs a cyclic process to produce ATP to cope up with Calvin cycle as it requires more ATP than the NADH In addition to the above, cyclic electron flow could operate independent of photosystem II. The production of oxygen and NADPH take place in non-cyclic electron flow and the system could switch to cyclic flow upon accumulation of oxygen and NADPH
They go into photosystem I.
They go into photosystem I.