Which one of the following statements is incorrect regarding regarding diffusion pressure deficit ( DPD ) ?

Options

A. DPD is directly proportional to the solute concentration of the system .
B. DPD of fully turgid cell becomes zero
C. DPD for a plasmolysed cell is highest
D. DPD of a flaccid cell is always more then osmotic pressure .

Answer

To solve the question regarding which statement is incorrect about diffusion pressure deficit (DPD), we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding DPD**:
- DPD is a measure of the difference between the osmotic pressure of a solution and the turgor pressure within a cell. It indicates the tendency of water to move into the cell.

2. **Analyzing the Statements**:
- **Statement 1**: "DPD is directly proportional to the solute concentration of the system."
- **Evaluation**: This statement is correct. As solute concentration increases, the osmotic pressure increases, leading to a higher DPD.

- **Statement 2**: "DPD of fully turgid cell becomes zero."
- **Evaluation**: This statement is also correct. In a fully turgid cell, the osmotic pressure is equal to the turgor pressure, resulting in a DPD of zero.

- **Statement 3**: "DPD for the Plasmoid cell is highest."
- **Evaluation**: This statement is correct. Plasmolysis occurs when a cell loses water, resulting in a higher DPD due to decreased turgor pressure.

- **Statement 4**: "DPD of the flaccid cell is always more than the osmotic pressure."
- **Evaluation**: This statement is incorrect. In a flaccid cell, the DPD is less than the osmotic pressure because the turgor pressure is low or absent.

3. **Conclusion**:
- The incorrect statement regarding diffusion pressure deficit (DPD) is **Statement 4**.

### Final Answer:
The incorrect statement regarding diffusion pressure deficit (DPD) is: **"DPD of the flaccid cell is always more than the osmotic pressure."**

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