Which of the following granules functions as storage reservoir for phosphate in bacteria ?

Options

A. Sulphur granules
B. Cyanophycean granules
C. Volutin granules
D. PHB granules

Answer

To answer the question "Which of the following granules functions as a storage reservoir for phosphate in bacteria?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for the specific type of granule in bacteria that stores phosphate.

2. **Identify Inclusion Granules**: Bacteria contain various types of inclusion granules that serve as storage reservoirs for different substances, including sulfur, nitrogen, phosphorus, and carbon.

3. **Evaluate the Options**:
- **Sulfur Granules**: These are known to store sulfur and are found in certain bacteria like Actinomyces. Thus, they do not serve as a phosphate reservoir.
- **Synophysin Granules**: These granules are involved in storing nitrogen and are found in cyanobacteria. Therefore, they are not the correct answer either.
- **PHB Granules (Polyhydroxybutyrate)**: These granules are used for storing carbon and energy, not phosphate. Hence, this option is also incorrect.
- **Volatine Granules**: Also known as metachromatic granules, these granules are specifically known for storing inorganic phosphate. They can be stained with methylene blue and appear red, and are found in bacteria such as Corynebacterium diphtheriae.

4. **Conclude the Answer**: Based on the evaluation, the granules that function as a storage reservoir for phosphate in bacteria are the **Volatine Granules**.

### Final Answer:
The correct answer is **Volatine Granules**.