Question

Which specific process in the light-dependent reactions produces oxygen and hydrogen ions?
the formation of NADPH
the production of ATP
the splitting of water
the excitation of electrons in photosytem I

Answer 1

The splitting of water (photolysis). In photosystem II water is split into O2, H+ (protons) and electrons; the protons build the proton gradient for ATP synthesis and O2 is released.