in the light reaction what is the function of the electron transport chain?

Answer 1

Several functions of the electron transport chain.

1. The electron transport chain that takes electrons from photosystem II to photosystem I gives up energy that is used to move hydrogen ions into the thylakoid space so they can rush out through a protein and make more ATP. It's also important that this chain does transport an electron to photosystem I to replace the electron lost by the chlorophyll. I think energy from this chain is used to split water molecules.
2. The electrons from photosystem I are transported through a short electron transport chain to be picked up by NADPH+.

Answer 2

The electron transport chain captures the energy from high energy electrons produced by the splitting of water (oxidation of oxygen). A proton gradient is created and is used to drive an ATP synthase. The electrons eventually reduce NADPH. There is so much energy in these electrons that it has to be captured stepwise. Electron transport chains make this possible.