How does photosystem II attribute to the photosynthesis?

These reactions involve the two photosystems (I and II). There is production of O2, ATP and NADP+ is reduced to NADH and H+. The NADP+ is the final electron acceptor and the electron donor is a water molecule. The O2 is released into the atmosphere. Photosystem II absorbs light captured by molecules of the antenna and pass to the molecules of the P680 reaction center which loses an electron. This excited electron exits from P680 and passes into a chain of electron acceptors. The electron-deficient molecule of P680 (oxidant) is capable of sensing and capturing the electrons from the electrons donor H2O. Photolysis is the lysis, in the presence of light, of the molecule of H2O into ½O2 + 2H + +2ē.