When a flaccid cell (e.g., grape raisin ) is placed in water

Options

A. its OP increases
B. its TP increases
C. its DPD increases
D. All of the above .

Answer

### Step-by-Step Solution:

1. **Understanding Flaccid Cells**: A flaccid cell, such as a grape raisin, is a plant cell that has lost water and has become shrunken. This typically occurs when the cell is placed in a hypertonic solution, where the concentration of solutes outside the cell is higher than inside, causing water to leave the cell.

**Hint**: Remember that a flaccid cell is one that has lost water and appears shriveled.

2. **Placing the Flaccid Cell in Water**: When a flaccid cell is placed in pure water (which is hypotonic relative to the cell's interior), water will move into the cell due to osmosis. Osmosis is the movement of water from an area of lower solute concentration to an area of higher solute concentration.

**Hint**: Think about how water moves in response to solute concentrations.

3. **Resulting Changes in the Cell**: As water enters the flaccid cell, it begins to swell. The cell's protoplasm (the living part of the cell) expands and pushes against the cell wall. This process is known as deplasmolysis, which is the rehydration of the cell.

**Hint**: Consider how the cell's structure changes when it absorbs water.

4. **Turgidity of the Cell**: The cell becomes turgid, meaning it is swollen and firm. The pressure exerted by the protoplasm on the cell wall is called turgor pressure. This pressure is crucial for maintaining the structure and rigidity of plant cells.

**Hint**: Turgor pressure is essential for plant health; it helps keep the plant upright.

5. **Understanding Turgor Pressure and Wall Pressure**: When the cell is turgid, the turgor pressure increases. The cell wall also exerts an equal and opposite pressure on the protoplasm, known as wall pressure. Together, these pressures help maintain the cell's shape.

**Hint**: Remember that both turgor pressure and wall pressure are important for cell stability.

6. **Osmotic Pressure and DPD**: In addition to turgor pressure, we can also discuss osmotic pressure (the pressure required to prevent water from entering the cell) and DPD (Diffusion Pressure Deficit), which is the difference between osmotic pressure and turgor pressure. In a flaccid cell, as it becomes turgid, the turgor pressure increases.

**Hint**: DPD is a key concept that relates to how water moves in and out of cells.

### Conclusion:
When a flaccid cell, such as a grape raisin, is placed in water, it absorbs water, becomes turgid, and experiences an increase in turgor pressure. This process is essential for the cell's health and functionality.