Question

Space between the cell wall and plasma membrane in a plasmolysed cell is filled with _______.

• A. water
• B. isotonic solution
• C. hypertonic solution
• D. fluid plasma

Answer 1

The correct option is C

Explanation of the correct answer:

1. The hypertonic solution is the solution in which the concentration of solute is more compared to the solution inside the cell.
2. Since the solution surrounding the cell is hypertonic, exosmosis takes place and the cell membrane shrinks inward from the cell wall.
3. Since cells wall is completely permeable, so, the space between the cell membrane and the cell wall is filled with the same hypertonic solution in which the cell was placed.

Explanation of the incorrect answer:

Option A:

1. Water has zero concentration of solutes.
2. The amount of solute is more inside the cell, so to equalise, water from outside enters inside the cell and makes cell flaccid.
3. There is no space left between cell wall and plasma membrane in this case.

Option B:

1. The solution which is taken in the question is hypertonic solution.

2. Isotonic solution is the one in which the concentration of the solute is equal to the solution inside the cell.

3. There will be zero net movement of water to and from the cell and shape of cell remains same.

4. Therefore, this option is not correct.

Option D:

1. Fluid plasma is the component of the blood which is the tissue of the animals.

2. It is not present in plants.

3. Hence, this option is invalid.

Final answer: Space between the cell wall and plasma membrane in a plasmolysed cell is filled with hypertonic solution.