Which statement describes the functioning of photosystem II?
A. light energy excites electrons in the electron transport chain in a photosynthetic unit
B. the excitation is passed along a molecule of P700 chlorophyll in the photosynthetic unit
C. The P680 chlorophyll donates a pair of photons to NADPH. which is thus converted to NADP+
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
Answer: D