The difference between non-cyclic and cyclic phosphorylation:

Explanation

In cyclic and non-cyclic photophosphorylation, the photosystems involved are different. Non-cyclic photophosphorylation uses both photosystem I and photosystem II, while cyclic photophosphorylation involves only photosystem I, as the electrons cycle back instead of moving linearly. Their end products also differ because non-cyclic photophosphorylation produces ATP, NADPH, and oxygen, whereas cyclic photophosphorylation produces only ATP since no water is split and no NADPH or oxygen is formed. The time of occurrence also varies, as cyclic photophosphorylation usually takes place when the cell needs extra ATP, while non-cyclic photophosphorylation occurs during normal photosynthesis. In summary, these processes differ in the photosystems they use, the products they form, and when they occur, allowing the plant to balance its energy requirements efficiently.