The electron released from PS I is first accepted by :-

Options

A. Plastoquinone
B. FRS
C. Cytochrome
D. Plastocyanin

Answer

To solve the question "The electron released from PS I is first accepted by:", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Photosystem I (PS I)**:
- Photosystem I is a protein complex located in the thylakoid membrane of chloroplasts. It plays a crucial role in the light-dependent reactions of photosynthesis.

2. **Identify the Role of PS I**:
- PS I absorbs light, specifically at a wavelength of around 700 nanometers, which excites electrons within the chlorophyll molecules.

3. **Electron Transfer Process**:
- When light is absorbed, electrons are released from PS I. These electrons need to be transferred to various electron carriers.

4. **Evaluate the Options**:
- The options provided are:
- Plastoquinone
- FRS (ferredoxin in reducing substance)
- Cytochrome
- Plastocyanin

5. **Determine the First Electron Acceptor**:
- The first acceptor of the electrons released from PS I is ferredoxin (FRS). This is because after the excitation of electrons in PS I, they are transferred directly to ferredoxin.

6. **Conclusion**:
- Therefore, the correct answer to the question is **FRS (ferredoxin)**.

### Final Answer:
The electron released from PS I is first accepted by **FRS (ferredoxin)**.

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