Question

Electrons from excited chlorophyll molecule of photosystem II are accepted first by

• A. Ferredoxin
• B. Pheophytin
• C. Cytochrome b
• D. Cytochrome f

Answer 1

Answer: (B)

Pheophytin

When the pigment in the reaction center of PS II (P${}_{680}$) absorbs a photon, an electron in this molecule gets excited and first transferred to electron acceptor namely pheophytin then to a series of redox molecules. The electron flow goes from Photosystem II to Photosystem I. It utilizes absorbed light for electron transport from plastocyanin on the lumenal side to ferredoxin on the stromal side of the thylakoid membrane to generate NADPH and ATP.

Thus, the correct answer is 'Pheophytin'.