A plasmolysed cell can be deplasmolysed by placing it in

Options

A. pure water or hypotonic solution
B. hypertonic solution
C. isotonic solution
D. saturated solution.

Explanation

To solve the question "A plasmolysed cell can be deplasmolysed by placing it in," we need to understand the concepts of plasmolysis and deplasmolysis.

### Step-by-Step Solution:

1. **Understanding Plasmolysis**:
- Plasmolysis occurs when a plant cell loses water in a hypertonic solution, causing the cell membrane to pull away from the cell wall. This results in the cell becoming plasmolysed.

2. **Understanding Deplasmolysis**:
- Deplasmolysis is the process of reversing plasmolysis. This occurs when a plasmolysed cell is placed in a solution that allows water to enter the cell, causing it to swell back to its original state.

3. **Identifying the Correct Solution**:
- To deplasmolyze a cell, it must be placed in a solution with a higher concentration of water (lower solute concentration) than the inside of the cell. This is known as a hypotonic solution.

4. **Evaluating the Options**:
- **Option 1: Pure water or hypotonic solution** - This is the correct choice as it provides a higher concentration of water, allowing water to move into the cell.
- **Option 2: Hypotonic solution** - This is also correct but is a repetition of the first option.
- **Option 3: Isotonic solution** - This would not cause water to move in or out of the cell, so it would not help in deplasmolysis.
- **Option 4: Saturated solution** - This would be hypertonic and would not help in deplasmolysis.

5. **Conclusion**:
- The best answer is **Option 1: Pure water or hypotonic solution**, as this will allow the cell to take in water and reverse the plasmolysis process.

### Final Answer:
A plasmolysed cell can be deplasmolysed by placing it in **pure water or a hypotonic solution**.