If the plant cell is immersed in water, the water continues to enter the cell until the

Options

A. (a) concentration of salts is the same inside the cell as outside
B. (b) cell bursts
C. (c) diffusion pressure deficit is the same inside the cell as outside
D. (d) concentration of water is the same inside the cell as outside

Answer

### Step-by-Step Solution:

1. **Understanding the Context**: When a plant cell is immersed in water, it experiences osmosis, which is the movement of water across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

2. **Identifying Conditions**: There are three conditions to consider:
- **Hypertonic**: Higher solute concentration outside the cell; water moves out, causing the cell to shrink.
- **Isotonic**: Equal solute concentration inside and outside the cell; water movement is balanced.
- **Hypotonic**: Lower solute concentration outside the cell; water moves into the cell, causing it to swell.

3. **Analyzing Water Movement**: In a hypotonic solution, water enters the plant cell, leading to an increase in turgor pressure. This pressure is essential for maintaining the cell's structure and function.

4. **Defining Water Potential**: Water potential is a measure of the potential energy in water, which influences the movement of water. It is affected by solute concentration (osmotic pressure) and pressure (turgor pressure).

5. **Diffusion Pressure Deficit (DPD)**: DPD is defined as the difference between the osmotic pressure and the turgor pressure. Water continues to enter the cell until the DPD inside the cell equals the DPD outside the cell.

6. **Conclusion**: Therefore, the correct condition under which water continues to enter the plant cell until equilibrium is reached is when the **diffusion pressure deficit (DPD) is the same inside the cell as outside**.

### Answer:
Water continues to enter the plant cell until the diffusion pressure deficit (DPD) is the same inside the cell as outside.

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