Question

What is meant by cyclic photophosphorylation?

Answer 1

Cyclic photophosphorylation:

1. Cyclic photophosphorylation is the process in which electrons move cyclically for synthesizing ATP molecules.
2. Only one photosystem (PS I) is used in cyclic photophosphorylation, and there is no decrease in NADP⁺.
3. When photosystem I absorbs light, the excited electron might transit an electron transport chain and make ATP.
4. The de-energized electron then travels towards the photosystem, replenishing the electron supply.
5. NADP⁺ is not reduced as that of the electron transfers towards the photosystem, and water is not required to refill the electron supply.
6. In the presence of sunlight, cyclic photophosphorylation could be exploited to generate a consistent supply of ATP.