Pressure on plant cell wall caused by osmotic movement of water is called

Options

A. O.P.
B. T.P.
C. Tonic pressure
D. Hypertonic pressure

Answer

**Step-by-Step Solution:**

1. **Understanding Osmosis**: Begin by recognizing that osmosis is the movement of water across a semi-permeable membrane from an area of higher water concentration to an area of lower water concentration. In the context of plant cells, this often involves the movement of water into the cell.

2. **Identifying the Solution Types**: In the scenario described, the plant cell is placed in a hypotonic solution (or pure water), while the inside of the cell is hypertonic compared to the external solution. This means that the concentration of solutes inside the cell is higher than that in the surrounding solution.

3. **Water Movement**: Due to the difference in concentration, water molecules will move into the plant cell through the process of endosmosis. This movement occurs because water moves from an area of higher concentration (outside the cell) to an area of lower concentration (inside the cell).

4. **Pressure on the Cell Wall**: As water enters the plant cell, it fills the vacuole and cytoplasm, causing the cell to swell. This swelling exerts pressure against the cell wall, which is a rigid structure surrounding the plant cell.

5. **Defining Turgor Pressure**: The pressure exerted by the fluid (water) inside the cell against the cell wall is known as turgor pressure. Turgor pressure is crucial for maintaining the structural integrity of plant cells and helps plants remain upright.

6. **Conclusion**: Therefore, the pressure on the plant cell wall caused by the osmotic movement of water is called **turgor pressure**.

---