Z scheme describes the oxidation or reduction changes that take place in light reactions of photosynthesis.
Here, both the photosystems are involved in the transfer of an electron, the transfer of electron resembles Z shape.
These reactions occur in the thylakoid membrane of the chloroplasts and in presence of sunlight, hence this is a light reaction.
The sunlight is converted to chemical energy in the form of ATP.
So Z scheme of non-cyclic phosphorylation, light-dependent photosynthesis is formed when all the carriers are set up in sequence on a redox potential scale.
