Define pressure potential

Explanation

### Step-by-Step Text Solution

1. **Definition of Pressure Potential**: Pressure potential, often denoted by the symbol Ψp, is defined as the hydrostatic pressure exerted by the fluid (usually water) within the plant cell's vacuole against the cell wall.

2. **Role of Hydrostatic Pressure**: This pressure is crucial because it helps maintain the turgidity of plant cells, which is essential for structural support and overall plant health. It keeps the water in a liquid state, preventing it from evaporating or turning into vapor.

3. **Alternate Names**: Pressure potential is also referred to as turgor pressure or wall pressure. These terms highlight its role in maintaining the integrity and firmness of plant cells.

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