Which out of the following is not a function of vacuole ?

Options

A. Storage
B. Providing turgidity and rigidity to the cell
C. Waste excretion
D. Locomotion

Explanation

### Step-by-Step Solution:

1. **Understanding the Vacuole**:
- The vacuole is a cell organelle primarily responsible for storage within the cell. It holds various substances, including cell sap, which is a mixture of water, nutrients, and waste products.

2. **Functions of Vacuole**:
- **Storage**: The vacuole stores cell sap, which includes water, ions, and nutrients. This is one of its primary functions.
- **Providing Turgidity and Rigidity**: The vacuole helps maintain the shape of the cell by storing water. When the vacuole is filled with water, it creates turgor pressure against the cell wall, making the cell firm and rigid.
- **Waste Excretion**: Vacuoles can also store waste products and help in their excretion from the cell.

3. **Identifying the Incorrect Function**:
- The question asks which option is **not** a function of the vacuole.
- The options include storage, providing rigidity, waste excretion, and locomotion.

4. **Analyzing the Options**:
- **Storage**: Correct function of the vacuole.
- **Providing Rigidity**: Correct function of the vacuole.
- **Waste Excretion**: Correct function of the vacuole.
- **Locomotion**: This is not a function of the vacuole. Locomotion refers to movement, which is typically facilitated by structures outside the cell, such as cilia or flagella.

5. **Conclusion**:
- The function that is not associated with the vacuole is **locomotion**. Therefore, the correct answer is option D.