Question

Arrange the following electron acceptors of Z-scheme of photosynthesis based on the movement of electron from P680 onwards.

(A) Iron-Sulphur Proteins
(B) Ferrodoxin
(C) Plastocyanin
(D) Plastoquinones
Choose the correct answer from the options given below:

• A. (A), (B), (C), (D).
• B. (D), (C), (B), (A).
• C. (D), (A), (B), (C).
• D. (D), (C), (A), (B).

Hint:

In the Z-scheme, electrons flow in the order: P680 → Plastoquinones → Plastocyanin → Iron-Sulphur Proteins → Ferrodoxin.

Answer 1

The Correct Option is D

Step 1: Understand the Z-scheme of photosynthesis.
The Z-scheme is the electron transport chain of photosynthesis. The electron flow starts with the excitation of electrons in P680 (Photosystem II), and the sequence of electron acceptors is as follows: \[ P680 \rightarrow \text{Plastoquinones} \rightarrow \text{Plastocyanin} \rightarrow \text{Iron-Sulphur Proteins} \rightarrow \text{Ferrodoxin} \] Step 2: Conclusion.
Thus, the correct order is: \[ \text{Plastoquinones} \rightarrow \text{Plastocyanin} \rightarrow \text{Iron-Sulphur Proteins} \rightarrow \text{Ferrodoxin} \]
Final Answer: \[ \boxed{\text{(D), (C), (A), (B)}} \]