........ surrounds the central vacuole.

Explanation

### Step-by-Step Solution:

1. **Identify the Structure**: The question asks about what surrounds the central vacuole in a plant cell.

2. **Understand the Plant Cell Components**: In a plant cell, the central vacuole is a large, membrane-bound organelle that plays a crucial role in maintaining cell structure and storing substances.

3. **Locate the Membrane**: The membrane that surrounds the central vacuole is known as the **tonoplast**.

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