In which of the following solutions, volume of a cell increases ?

Options

A. Hypotonic
B. Isotopic
C. Hypertonic
D. Supertonic

Answer

To determine in which solution the volume of a cell increases, we need to understand the concepts of hypertonic, hypotonic, and isotonic solutions.

### Step-by-Step Solution:

1. **Understand the Types of Solutions**:
- **Isotonic Solution**: This is a solution where the concentration of solutes is equal inside and outside the cell. There is no net movement of water, so the cell remains the same size.
- **Hypertonic Solution**: In this solution, the concentration of solutes outside the cell is higher than inside. Water moves out of the cell to balance the concentration, causing the cell to shrink.
- **Hypotonic Solution**: Here, the concentration of solutes outside the cell is lower than inside. Water moves into the cell to balance the concentration, leading to an increase in cell volume.

2. **Identify the Correct Solution**:
- From the definitions, we can conclude that when a cell is placed in a **hypotonic solution**, water will move into the cell because the concentration of solutes is lower outside. This influx of water causes the cell to swell and increase in volume.

3. **Conclusion**:
- Therefore, the volume of the cell increases in a **hypotonic solution**.

### Final Answer:
The volume of a cell increases in a **hypotonic solution**.