Question

Pigment system- II is concerned with

• A. Photolysis of water
• B. Reduction of $C{O}_2$
• C. Flowering
• D. None of the above

Answer 1

The correct option is A Photolysis of water

Photosystem II has P${}_{680}$ reaction center wherein oxygen atoms of two water molecules bind to a cluster of manganese atoms. These Mn atoms are bound to the reaction center and associated with an enzyme that splits water, removes electrons one at a time. These electrons fill the electron deficiency /gaps formed by emission of electrons from the reaction center due to absorption of light energy. Immediately after removal of four electrons from the two water molecules, O${}_2$ is released. Sunlight driven splitting of water is called as photolysis. So, the correct answer is option A.