To better understand Cyclic Flow of electrons vs. Non-Cyclic Flow, I need to know the definiition of

To understand these words, you need to know about the light-dependent reactions.

Really quickly, the light dependent reactions consist of photosystem II and photosystem I.



In photosystem II, the electron is replaced by the electrons found in water (after it splits) - this is called a cyclic reaction.

In photosystem I, the electron is lost as well, but it replaced by the electron from photosystem II, so both systems are involved - this is called non-cyclic reaction. During these reactions, NADPH is reduced.

Cyclic insinuates that there is a loop of some sort.