Excited electrons from photo system-II are captured by:

Explanation

Plastoquinone (PQ) is the correct answer as it accepts excited electrons from photosystem-II and transfers them down the electron transport chain. Plastocyanin (PC) and Cytochrome-b are involved in the electron transfer process but do not directly capture excited electrons like plastoquinone does. The term 'Pentamerous' is unrelated to the process of capturing excited electrons in photosynthesis.