Question

In Photosystem I the first electron acceptor is:

• A. Plastocyanin
• B. Cytochrome
• C. Pastoquinone
• D. An Iron sulphur protein

Answer 1

The correct option is (A):

Explanation of the correct option:

1. Electrons are carried by the carrier proteins like plastoquinone, cytochrome and plastocyanin from the photosystem II.
   
2. The electron that comes from Photosystem II by the carrier protein molecules is accepted by iron​-sulphur proteins present in Photosystem I.
   

Explanation of the incorrect options:

Option (B):

1. Plastocyanin is one of the carrier proteins that carries the electrons from ​the Photosystem II.
   

Option (C):

1. Cytochrome acts as a part of the electron transport pathway that helps with the transfer of electrons. ​

Option (D):

1. ​Plastoquinone is responsible for acting as the electron carrier.
   

Final Answer: In Photosystem I the first electron acceptor is an iron-sulphur protein.