A) cytochrome-\[b\]
B) cytochrome-\[f\]
C) quinone
D) ferredoxin
Correct Answer: C
Solution :
Photosysiem\[\text{-II}\] is a photosynthetic pigment system along with some electron carriers that is located in the apressed part of grana thylakoids. Photocentre has a dimer of special chlorophy\[\text{II-a}\] molecules called \[{{\text{P}}_{\text{680}\text{.}\,}}{{\text{P}}_{\text{680}}}\] of photosystem\[\text{-II}\] absorbs light energy, gets excited and transfers its electrons to electron acceptor molecule phaeophytin. Phaeophyrin on accepting electrons become strong reducing agent. It donates, its electrons to downstream component of ETC, ie, quinone, cyt\[-b\]cyt\[-f\] complex, plasrocyanin. While passing over cytochrome complex, electron loses sufficient energy to synthesise ATP. Plastocyanin is a copper containing soluble protein, which transfers electrons to \[{{\text{P}}_{\text{700}}}\] reaction centre of photosystem-I. On getting excited, \[{{\text{P}}_{\text{700}}}\] 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.
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