Which is incorrect ?

Options

A. `Psi_(omega)=Psi_(pi)+Psi_(p)`
B. `Psi_(omega)=Psi_(m)+Psi_(pi)+Psi_(p).`
C. `Psi_(omega)=Psi_(s)+Psi_(p)`
D. `Psi_(omega)=Psi_(m)+Psi_(pi)+Psi_(p).`

Answer

To determine which statement is incorrect regarding water potential in plants, we need to analyze the components of water potential and the relationships between them.

### Step-by-Step Solution:

1. **Understanding Water Potential (Ψw)**:
Water potential (Ψw) is a measure of the potential energy in water and is influenced by several factors. It is expressed as the sum of different potentials.

2. **Components of Water Potential**:
- **Osmotic Potential (Ψs)**: This is the potential due to the presence of solutes in the water. The more solutes present, the lower the osmotic potential (more negative value).
- **Pressure Potential (Ψp)**: This is the potential due to the pressure exerted by the fluid in the plant cells. It can be positive (turgor pressure) or negative (tension in xylem).
- **Gravitational Potential (Ψg)**: This is the potential energy due to the height of the water column in relation to gravity.

3. **Formula for Water Potential**:
The water potential can be expressed mathematically as:
\[ Ψw = Ψs + Ψp + Ψg \]
This equation shows that water potential is the sum of osmotic potential, pressure potential, and gravitational potential.

4. **Evaluating the Options**:
- If the options provided in the question relate to the components of water potential, we need to identify any statement that misrepresents these components or their relationships.
- For example, if an option states that water potential does not depend on osmotic potential or pressure potential, that would be incorrect.

5. **Conclusion**:
After analyzing the components and their relationships, we conclude that the statement indicating that water potential is not influenced by one of its components (like osmotic or pressure potential) is incorrect.

### Final Answer:
The incorrect statement regarding water potential is the one that misrepresents its components or their relationships.