OP of the cell can be measured by:

Options

A. Plasmolysis method
B. Osmometer
C. Molar concentration of cell sap
D. Deplasmolysis

Answer

To determine how osmotic pressure (OP) of a cell can be measured, we need to analyze the options provided in the question. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand Osmotic Pressure
Osmotic pressure (OP) is defined as the minimum hydrostatic pressure required to stop the flow of water across a semi-permeable membrane when a solution is separated from pure water. It is represented by the symbol π.

### Step 2: Evaluate the Options
1. **Plasma Lysis Method**: This method refers to the shrinkage of protoplasm when cells are placed in a hypertonic solution. It does not measure osmotic pressure directly.

2. **Osmometer**: An osmometer is a device specifically designed to measure osmotic pressure and osmotic concentration. This is a valid method for measuring osmotic pressure.

3. **Molar Concentration of the Cell Sap**: While molar concentration gives an idea of solute concentration, it does not directly measure osmotic pressure.

4. **D Plasma Lysis**: This term refers to the process where cells regain their shape when placed in a hypotonic solution. Like plasma lysis, it does not measure osmotic pressure directly.

### Step 3: Identify the Correct Answer
From the evaluation of the options, the only method that can measure osmotic pressure is the **Osmometer**.

### Final Answer
The osmotic pressure of the cell can be measured by: **Osmometer**.

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