Question

Refer to the given reaction.
$2H_{2}O\to 4H^{+}+O_2+4e^{-}$
Where does this reaction take place in the chloroplasts of plants?

• A. Outer surface of thylakoid membrane
• B. Inner surface of thylakoid membrane
• C. In the matrix (stroma)
• D. Intermembrane space

Answer 1

The correct option is B Inner surface of thylakoid membrane

The splitting of water is associated with the PS II. Water is split into $H^{+},\left[O\right]$ and electrons. The electrons needed to replace those removed from photosystem I are provided by photosystem II.

$2H_{2}O\to 4H^{+}+O_2+4_{e^{-}}$

Water splitting complex is associated with the PSII, which itself is physically located on the inner side of the membrane of the thylakoid.

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