Photosynthesis in Higher Plants — BIOLOGY STD 11 Science — Question

4. Inner surface of thylakoid membrane.

Explanation:

The thylakoid is a photosynthetic unit in the chloroplast. It is a membrane bound structure. The membrane has photosystems I and II embedded in it, in the form of chemicals and molecules. Splitting of water is associated with PS-II, which occurs in presence of ions on the inner surface of thylakoid membrane.

$2\text{H}_{2}\text{O}\ {\xrightarrow{\ \ \ \ \ \ \ \ \ }}4\text{H}^{+}+\text{O}^{2}+4\text{e}^{-}$

Photosystem I and II are associated with light reactions.