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 from P680 to plastoquinones, plastocyanin, iron-sulphur proteins, and finally to ferrodoxin.

Answer 1

The Correct Option is D

Step 1: Understanding the Photosynthetic Z-scheme.
The Z-scheme illustrates electron flow during photosynthesis. Upon excitation in Photosystem II (P680), electrons are transferred through a chain of acceptors:\[P680 \rightarrow \text{Plastoquinones} \rightarrow \text{Plastocyanin} \rightarrow \text{Iron-Sulphur Proteins} \rightarrow \text{Ferrodoxin}\]Step 2: Sequence Analysis.
- Plastoquinones (D) receive electrons directly from P680.
- Plastocyanin (C) is the subsequent electron acceptor.
- Iron-Sulphur Proteins (A) participate in electron transport after Plastocyanin.
- Ferrodoxin (B) serves as the terminal electron acceptor.Step 3: Conclusion.
The correct sequence of electron transfer is:\[\text{Plastoquinones} \rightarrow \text{Plastocyanin} \rightarrow \text{Iron-Sulphur Proteins} \rightarrow \text{Ferrodoxin}\]
Final Answer: \[ \boxed{\text{(D), (C), (A), (B)}} \]