Photosystem-II is a photosynthetic pigment system alongwith some electron carriers that is located in the apressed part of grana thylakoids. Photocentre has a dimer of special chlorophyll-a molecules called P680.P680 of photosystem-II absorbs light energy, gets excited and transfers its electrons to electron acceptor molecule phaeophytin. Phaeophytin on accepting electrons become strong reducing agent. It donates, its electrons to downstream component of ETC, ie, quinone, cyt- b cyt- f complex, plastocyanin. While passing over cytochrome complex, electron losses sufficient energy to synthesize ATP. Plastocyanin is a copper containing soluble protein, which transfers electrons to P700 reaction centre of photosystem-I. On geting excited, P700 hands over electrons to a special chlorophyll molecule X from where electrons are passed to membrane bound iron-sulphur protein for transfer to another soluble protein ferredoxin. 
Electrons from excited chlorophyll molecule of photosystem-II are accepted first by
NEET UG 2008 — Botany Photosynthesis in Higher Plants
Electrons from excited chlorophyll molecule of photosystem-II are accepted first by
Held on 30 Apr 2008 · Verified 9 Jul 2026.
Options
- A
cytochrome-b
- B
cytochrome-f
- C
quinone
- D
ferredoxin
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