Cell turgidity is caused by

Options

A. Endosmosis
B. Exosmosis
C. Plasmolysis
D. Diffusion

Answer

### Step-by-Step Solution:

1. **Understanding Cell Turgidity**:
- Turgidity refers to the state of a plant cell when it is swollen with water, making the cell firm and providing structural support to the plant.

2. **Role of Water Movement**:
- Turgidity is primarily influenced by the movement of water into the cell. This movement occurs through a process called osmosis.

3. **Defining Osmosis**:
- Osmosis is the movement of water across a semi-permeable membrane from an area of lower solute concentration (higher water concentration) to an area of higher solute concentration (lower water concentration).

4. **Identifying the Process**:
- When a plant cell is placed in a surrounding medium with a higher water concentration (hypotonic solution), water moves into the cell. This process is specifically called **endosmosis**.

5. **Understanding Other Options**:
- **Exosmosis**: This is the process of water moving out of the cell, which would lead to a loss of turgidity.
- **Plasmolysis**: This occurs when a cell loses water in a hypertonic solution, causing the cell to shrink and lose turgidity.
- **Diffusion**: This is the movement of solutes, not water, and does not directly cause turgidity.

6. **Conclusion**:
- Since turgidity is caused by the influx of water into the cell, the correct answer is **option A: endosmosis**.