Question

In photosystem-$I$ the first electron acceptor is

• A. Plastocyanin.
• B. An iron-sulphur protein.
• C. Ferredoxin.
• D. Cytochrome.

Answer 1

The correct option is B An iron-sulphur protein.

The reaction center of photosystem II is called P${}_6$${}_8$${}_0$, whereas reaction center of photosystem I is called P${}_7$${}_0$${}_0$. In photosystem II, the electrons emitted by reaction center are first captured by phaeophytin whereas in photosystem I, the electrons emitted by reaction center are first captured by iron sulphur protein.

Thus, the correct answer is option B.