Which Statement Describes the Functioning of Photosystem II

Question

Which statement describes the functioning of photosystem II?
A)Light energy excites electrons in the thylakoid membrane electron transport chain.
B)Photons are passed along to a reaction-centre chlorophyll.
C)The P680 chlorophyll donates a pair of protons to NADP⁺, which is thus converted to NADPH.
D)The electron vacancies in P680⁺ are filled by electrons derived from water.
E)The splitting of water yields molecular carbon dioxide as a by-product.

Accepted Answer

Photosystem II functions by using light energy to excite electrons in the P680 chlorophyll. These excited electrons are passed along a thylakoid membrane electron transport chain, and the electron vacancies in P680⁺ are filled by electrons derived from the splitting of water. This process results in the release of oxygen as a by-product. Therefore, the best choice is D, which describes the splitting of water to fill the electron vacancies in P680⁺.