During non-cyclic electron transport of photosynthesis of higher plants, A is the ultimate electron donor and B is the ultimate electron acceptor. A and B are respectively.

In the non-cyclic electron transport of photosynthesis of higher plants, the electrons of water ultimately reach NADP+ to form NADPH after passing through Mn, Tyrosine or Yz, P 680, Pheo, QA, QB, PQ, Fe.S protein, Cytochrome f, Plastocyanin, P700, and A0, A1, Fx, FA/B, ferredoxin and FNR enzyme.