At fully turgid stage the cell wall prevents the protoplast from increasing in size and exerts a pressure called

Options

A. Wall pressure
B. Turgor pressure
C. Osmotic pressure
D. Suction pressure

Answer

To solve the question, "At fully turgid stage the cell wall prevents the protoplast from increasing in size and exerts a pressure called," we can follow these steps:

### Step 1: Understand Turgidity
- **Explanation**: Turgidity refers to the state of being swollen or firm due to the presence of water in plant cells. When a plant cell is fully turgid, it means that it is filled with water, and the internal pressure is high.
- **Hint**: Remember that turgidity is crucial for maintaining the structure and rigidity of plant cells.

### Step 2: Identify the Role of the Cell Wall
- **Explanation**: The cell wall is a rigid structure that surrounds the protoplast (the living part of the cell). When the protoplast swells due to water intake, the cell wall exerts a counteracting force.
- **Hint**: Think about how the cell wall provides structure and support to prevent over-expansion of the cell.

### Step 3: Define Wall Pressure
- **Explanation**: The pressure exerted by the cell wall on the protoplast is known as wall pressure. This pressure counteracts the internal turgor pressure exerted by the cytoplasm.
- **Hint**: Wall pressure is the force that prevents the cell from bursting when it is full of water.

### Step 4: Differentiate Between Turgor Pressure and Wall Pressure
- **Explanation**: Turgor pressure is the pressure exerted by the cytoplasm against the cell wall, while wall pressure is the opposing force exerted by the cell wall on the protoplast.
- **Hint**: Remember that turgor pressure pushes outward, while wall pressure pushes inward.

### Step 5: Conclusion
- **Final Answer**: The pressure exerted by the cell wall when the protoplast is fully turgid is called **wall pressure**.

### Summary
- At the fully turgid stage, the cell wall prevents the protoplast from increasing in size and exerts a pressure known as **wall pressure**.