A cell kept in a solution increases in volume. The solution is

Options

A. Hypotonic
B. Isotonic
C. Hypertonic
D. Either A or B

Answer

To determine the type of solution in which a cell increases in volume, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Solutions**: There are three types of solutions in relation to a cell:
- **Isotonic**: The concentration of solutes is the same inside and outside the cell, resulting in no net movement of water.
- **Hypotonic**: The concentration of solutes is lower outside the cell than inside. This causes water to move into the cell.
- **Hypertonic**: The concentration of solutes is higher outside the cell than inside. This causes water to move out of the cell.

2. **Analyze the Question**: The question states that a cell kept in a solution increases in volume. This indicates that water must be entering the cell.

3. **Identify the Correct Solution Type**:
- In a **hypotonic solution**, water moves from an area of lower solute concentration (outside the cell) to an area of higher solute concentration (inside the cell). This influx of water causes the cell to swell and increase in volume.
- In an **isotonic solution**, there is no net movement of water, so the cell's volume remains the same.
- In a **hypertonic solution**, water moves out of the cell, leading to a decrease in volume.

4. **Conclusion**: Since the cell is increasing in volume, it must be in a **hypotonic solution**.

### Final Answer:
The solution is **hypotonic**.

---