Question

Splitting of water is associated with

• A. Photosystem I
• B. Lumen of thylakoid
• C. Both Photosystem I and II
• D. Inner surface of thylakoid membrane

Answer 1

The correct option is A Photosystem I

• Splitting of water occurs in the Photosystem II. It is a water-splitting complex in which the electrons that are energised (by photons) are replaced by the electrons released as a result of splitting of water to form hydrogen ion and oxygen. Since, this oxygen-evolving complex needed for the splitting of water is associated only with photosystem II and is not present in photosystem I, splitting of water is associated with PS-II.
  
• the photosystems are found distributed on the thylakoid membrane and water-splitting reaction occurs on the lumenal side of the thylakoid membrane (inner side).
  

So the correct option is 'Inner surface of thylakoid membrane'.