DPD is equal to

Options

A. `OPxxTP`(WP)
B. OP+TP(WP)
C. OP-TP(WP)
D. TP(WP)-OP.

Answer

To solve the question regarding what DPD (Diffusion Pressure Deficit) is equal to, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of DPD**:
- DPD stands for Diffusion Pressure Deficit. It indicates the ability of a cell to absorb water and is also referred to as suction pressure.

2. **Identify the Components Involved**:
- DPD is related to two key pressures:
- **Osmotic Pressure (OP)**: The pressure required to prevent the flow of water into a solution via osmosis.
- **Total Pressure (TP)**: This is the overall pressure within the cell, which includes both osmotic pressure and pressure potential.

3. **Establish the Relationship**:
- The formula that defines DPD is:
\[ \text{DPD} = \text{OP} - \text{TP} \]
- This means DPD is the difference between osmotic pressure and total pressure.

4. **Consider the Implications**:
- A DPD of 0 indicates that there is no net movement of water into or out of the cell. Water moves from areas of lower DPD to areas of higher DPD.

5. **Select the Correct Option**:
- Given the options:
- OP × TP
- OP + TP
- OP - TP
- TP - OP
- The correct answer based on our derived formula is:
\[ \text{DPD} = \text{OP} - \text{TP} \]
- Therefore, the correct option is **OP - TP**.

### Final Answer:
DPD is equal to **OP - TP**.

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