The accurate relationship between SP, OP, TP can be expressed as

Options

A. SP = OP + TP
B. OP = SP – TP
C. TP = SP – OP
D. SP = OP – TP

Answer

To express the accurate relationship between suction pressure (SP), osmotic pressure (OP), and turgor pressure (TP), we can follow these steps:

### Step-by-Step Solution:

1. **Define the Terms**:
- Suction Pressure (SP): This is the pressure that draws water into the plant cells.
- Osmotic Pressure (OP): This is the pressure required to prevent the flow of water into the cell by osmosis.
- Turgor Pressure (TP): This is the pressure exerted by the fluid (water) inside the cell against the cell wall.

2. **Understand the Relationship**:
- The relationship between these pressures can be derived from the concept of Diffusion Pressure Deficit (DPD), which is defined as the difference between the osmotic pressure and the turgor pressure.

3. **Use the Formula**:
- The formula for DPD is:
\[ DPD = OP - TP \]
- Since suction pressure (SP) is equivalent to DPD, we can write:
\[ SP = OP - TP \]

4. **Rearranging the Equation**:
- From the equation \( SP = OP - TP \), we can rearrange it to express the relationship clearly:
\[ SP = OP - TP \]
- This shows that suction pressure is equal to osmotic pressure minus turgor pressure.

5. **Conclusion**:
- Therefore, the accurate relationship between suction pressure, osmotic pressure, and turgor pressure can be expressed as:
\[ SP = OP - TP \]