MCQ
${O_2}$ evolution is directly associated with
  • A
    $PS -I$
  • $PS -II$
  • C
    Phytochrome
  • D
    Phycocyanin

Answer

Correct option: B.
$PS -II$
b
(b) The photosystem-$II$ (Reaction centre of $P-680$) extracts an $e^-$ from water returning to its unexcited state.

The removal of four $e^-$ from two molecules of water requires $4$ quanta of light to fall on $PS-II$ and leads to the production of $4H^+$ ions and one molecules of $O_2$.

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