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 statement one by one.

### Step-by-Step Solution:

1. **Understanding DPD**:
- DPD, or diffusion pressure deficit, 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."
- This statement is **incorrect**. DPD is actually directly proportional to the concentration of the solution, not just the solute concentration. The presence of solutes affects the osmotic pressure, which in turn affects DPD.

- **Statement 2**: "DPD of a fully turgid cell becomes 0."
- This statement is **correct**. In a fully turgid cell, the turgor pressure equals the osmotic pressure, resulting in a DPD of 0.

- **Statement 3**: "DPD for a plasmolyzed cell is the highest."
- This statement is **correct**. In a plasmolyzed cell, the cell has lost water, leading to a high DPD as the osmotic pressure is greater than the turgor pressure.

- **Statement 4**: "DPD of a flaccid cell is always more than osmotic pressure."
- This statement is **correct**. In a flaccid cell, the DPD is greater than the turgor pressure, which means it is also greater than the osmotic pressure.

3. **Conclusion**:
- The only incorrect statement among the options provided is the first one. Therefore, the answer to the question is that the first statement is incorrect regarding diffusion pressure deficit (DPD).

### Final Answer:
The incorrect statement regarding diffusion pressure deficit (DPD) is: "DPD is directly proportional to the solute concentration of the system."

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