Question

Four electrons produced during photolysis of water will enter

• A. PS I
• B. PQ
• C. PS II
• D. PC

Answer 1

The correct option is C PS II

• The photolysis of water (H${}_2$O) in the light reactions of photosynthesis occurs in the water-splitting complex of photosystem II.
• photosystem II in thylakoid membranes of chloroplasts where light is used to split water molecules as represented by the following equation: 2H${}_2$O → 4H+ + 4e- + O${}_2$.
• Oxygen (O${}_2$) is liberated to the atmosphere as a waste product in this process and the electrons (e-) are gained to replace those lost through photoexcitation from chlorophyll a in the reaction center of photosystem II which begins noncyclic photophosphorylation. Hence four electrons produced during photolysis of water will enter PS II.
• So, the correct answer is 'PS II'.