A) PS-I
B) PS-II
C) phytochrome
D) phycocyanin
Correct Answer: B
Solution :
The photosystem-II (Reaction centre P-680) extracts an electron from water returning to its unexcited state. The removal of four electrons from two molecules of water requires four quanta of light to fall on PS-II and leads to the production of four H+ ions and one molecules of \[{{O}_{2}}.\]\[2{{H}_{2}}O\xrightarrow[M{{n}^{++}}]{4Photons}4{{e}^{-}}+4{{H}^{+}}+{{O}_{2}}\]
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