In photosynthetic ' Quinone cycle' the number of electrons transferred from `PQH_2` to Cytochrome `b_6` is

Options

A. One
B. Two
C. Three
D. Four

Answer

To solve the question regarding the number of electrons transferred from PQH2 to Cytochrome b6 in the photosynthetic quinone cycle, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Components**:
- In the photosynthetic electron transport chain, PQH2 (plastoquinol) is a key electron carrier that transfers electrons from Photosystem II (PSII) to the next components in the chain, including Cytochrome b6.

2. **Identifying the Electron Transfer**:
- PQH2 is generated when plastoquinone (PQ) accepts two electrons and two protons (H+). When PQH2 transfers its electrons, it does so in a specific manner.

3. **Electrons Transferred**:
- PQH2 donates two electrons during its transfer to Cytochrome b6. This is a crucial step in the electron transport chain, as it helps in the continuation of the photosynthetic process.

4. **Conclusion**:
- Therefore, the number of electrons transferred from PQH2 to Cytochrome b6 is **2**.

### Final Answer:
The number of electrons transferred from PQH2 to Cytochrome b6 is **2**.

---