The pressure required to stop the movement of water completely into a cell is called

Options

A. Osmotic pressure
B. Turgor pressure
C. Diffusion pressure
D. Diffusion pressure deficit

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks for the term that describes the pressure required to completely stop the movement of water into a cell.

2. **Identifying Key Concepts**: The movement of water into a cell is influenced by osmotic pressure, which is the pressure needed to prevent water from moving across a semi-permeable membrane.

3. **Defining Osmotic Pressure**: Osmotic pressure can be defined as the pressure that must be applied to a solution to prevent the inward flow of water across a semi-permeable membrane. It is essentially the force that counteracts the movement of water into the cell.

4. **Explaining the Role of Osmotic Pressure**: When water moves into a cell, it does so until the osmotic potential reaches equilibrium. The osmotic pressure is the measure of the tendency of water to move into a cell by osmosis.

5. **Differentiating from Other Pressures**:
- **Turgor Pressure**: This is the pressure exerted by the fluid inside the cell against the cell wall, which is not the same as osmotic pressure.
- **Diffusion Pressure**: This refers to the movement of molecules from an area of higher concentration to an area of lower concentration, which is also not the answer.

6. **Conclusion**: Therefore, the correct term for the pressure required to stop the movement of water completely into a cell is **osmotic pressure**.

**Final Answer**: The pressure required to stop the movement of water completely into a cell is called **osmotic pressure**.

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