Some electron from the second primary acceptor may pass back to chlorophyll molecules by electron carrier system, yielding ATP. This process is called:

Explanation

In cyclic photophosphorylation, electrons released from the reaction center of Photosystem I (PSI) are cycled back to the chlorophyll molecules through an electron carrier system, ultimately leading to the generation of ATP. Cyclic photophosphorylation is particularly important in certain types of photosynthetic bacteria and in the light reactions of photosynthesis in the chloroplasts of some plants. It allows the cell to generate ATP without the simultaneous production of NADPH and oxygen.