Select the correct statement from the following

Options

A. Osmotic pressure is the negative pressure applied on hypertonic solution to stop osmosis .
B. Osmosis potential is positive.
C. More is the solute concentration of solution , more will be the pressure required to prevent water from diffusing in.
D. The net direction and the rate of osmosis does not depend on the pressure gradient nor on concentration gradient .

Answer

To solve the question, we need to evaluate each of the given statements regarding osmotic pressure and osmotic potential. Let's break it down step by step.

### Step 1: Analyze the First Statement
The first statement claims that "osmotic pressure is a negative pressure applied on the hypertonic solution to stop osmosis."

- **Evaluation**: This statement is incorrect. Osmotic pressure is actually a positive pressure that must be applied to a hypertonic solution to prevent water from moving into it. Therefore, this statement is false.

### Step 2: Analyze the Second Statement
The second statement states that "osmotic potential is positive."

- **Evaluation**: This statement is also incorrect. Osmotic potential (or osmotic pressure) is always expressed as a negative value because it reflects the tendency of water to move into a solution. Hence, this statement is false.

### Step 3: Analyze the Third Statement
The third statement asserts that "more is the solute concentration of a solution, more will be the pressure required to prevent water from dissolving it."

- **Evaluation**: This statement is correct. As the solute concentration increases, the osmotic pressure increases, meaning more pressure is required to prevent water from entering the solution. This statement is true.

### Step 4: Analyze the Fourth Statement
The fourth statement claims that "the net direction and the rate of osmosis does not depend on the pressure gradient nor on the concentration gradient."

- **Evaluation**: This statement is incorrect. The net direction and rate of osmosis are indeed influenced by both the pressure gradient and the concentration gradient. Therefore, this statement is false.

### Conclusion
After analyzing all the statements, we find that the only correct statement is the third one.

**Correct Answer**: Option 3

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