Question

Manganese, calcium and chloride ions present is PS-II play an important role in the

• A. Absorpion of light.
• B. $C{O}_2$ assimilation.
• C. Photolysis of water.
• D. ATP synthesis.

Answer 1

The correct option is C Photolysis of water.

Photolysis of water (breaking of water with light energy) occurs when PSII reaction centre becomes oxidized by transferring an electron to primary acceptor.

$4H_{2}O\underset{Chlorophyll}{\overset{Light}{\to }}2H_{2}O+4H^{+}+4e^{-}+O_2$

The process requires the presence of Mn${}^{2+}$, Ca${}^{2+}$ and Cl${}^{-}$ energy gained in photolysis is utilized in Calvin cycle.