Solution

Light reactions occur inside thylakoids. It is dependent upon light. It involves photolysis of water (breaking of water into $$H_{2}$$ and $$O_{2}$$ and production of assimilation power (NADPH and ATP). An electron released during photolysis of water are picked up by $$P_{680}$$ photo center of photosystem II. From here electrons passes over series of carrier which includes PQ, cytochrome b-f complex, and PC. While passing over cytochrome complex, the electron losses sufficient energy for creation of proton gradient and ATP from ADP and inorganic phosphate. From PC electron losses sufficient energy for creation of proton gradient and ATP from ADP and inorganic phosphate. From PC electron is picked by the trap center $$P_{700} $$of photosystem I, which pushes out electron after absorbing light energy. Electron passes over carriers Fes, ferredoxin and NADP reductase which gives an electron to $$NADP^+$$ for combing with $$H^+$$ to produce NADPH.

$$NADP^+ 2e^- + H^{+} \xrightarrow[NADP \,\, reductase]{} NADPH $$

So, the correct answer is 'PSII, plastoquinone, cytochromes, PSI, ferredoxin'.