When water enters a plant cell due to diffusion causing a pressure built against the cell wall makes it turgid. This increase the

Answer

**Step-by-Step Solution:**

1. **Understanding the Process of Water Entry:**
- Water enters a plant cell through the process of diffusion. This occurs when water moves from an area of higher concentration (outside the cell) to an area of lower concentration (inside the cell).

2. **Effect of Water Entry on Cell Structure:**
- As water enters the cell, it fills the vacuole and cytoplasm, causing the cell to swell. This swelling results in the cell pushing against the rigid cell wall.

3. **Definition of Turgidity:**
- The pressure exerted by the swollen cell against the cell wall is known as turgor pressure. When the turgor pressure is sufficiently high, the cell becomes turgid, which is a state of firmness and rigidity.

4. **Pressure Potential Concept:**
- The turgor pressure creates a pressure potential within the cell. This is the difference between the internal pressure (turgor pressure) and the external pressure exerted by the cell wall.

5. **Conclusion:**
- Therefore, when water enters a plant cell due to diffusion, it increases the turgor pressure, which in turn increases the pressure potential within the cell.

**Final Answer:**
- This increase the **pressure potential**.

---