Read the following statements and find out the incorrect statement.

Options

A. More the solute concentration in funnel, greater will be the pressure reqiured to prevent water form diffusuing in it.
B. Numerically osmotic pressure is eqiuvalent to osmotic potential, but the sign is opposite.
C. Osmotic pressure is negative pressure while osmotic potential is positive.
D. In plant cells, the cell membrane and tonoplast together are important determinants of movements of molecules in or out of the cell.

Explanation

To determine the incorrect statement from the provided options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- The first statement claims that "more the solute concentration in the funnel, greater will be the pressure required to prevent water from diffusing in it."
- **Evaluation**: This statement is true. Higher solute concentration creates a higher osmotic pressure, which indeed requires more pressure to prevent water from entering.

2. **Analyze the Second Statement**:
- The second statement states that "numerically, osmotic pressure is equivalent to osmotic potential, but the sign is opposite."
- **Evaluation**: This statement is also true. Osmotic pressure and osmotic potential are related but have opposite signs; osmotic pressure is positive while osmotic potential is negative.

3. **Analyze the Third Statement**:
- The third statement asserts that "osmotic pressure is negative while the osmotic potential is positive."
- **Evaluation**: This statement is false. Osmotic pressure is always positive, as it is the pressure required to prevent water from moving into a solution. In contrast, osmotic potential is negative because it reflects the tendency of water to move into the solution.

4. **Analyze the Fourth Statement**:
- The fourth statement mentions that "the cell membrane and tonoplast together are important determinants to the movement of molecules in or out of the cell."
- **Evaluation**: This statement is true. The cell membrane and tonoplast regulate the movement of substances, acting as selective barriers.

### Conclusion:
The incorrect statement among the options is the third statement: "osmotic pressure is negative while the osmotic potential is positive."