Question

The space between the cell wall and plasma
membrane in a plasmolysed cell is filled with
(a) isotonic solution. (b) hypotonic solution
(c) hypertonic solution. (d) water

Answer 1

Answer: After plasmolysis the gap between the cell wall and the cell membrane in a plant cell is filled with (c) hypertonic solution.

Explanation:

Plasmolysis is the process in which cells lose water in a hypertonic solution. The reverse process, deplasmolysis or cytolysis, can occur if the cell is in a hypotonic solution resulting in a lower external osmotic pressure and a net flow of water into the cell. Through observation of plasmolysis and deplasmolysis, it is possible to determine the tonicity of the cell's environment as well as the rate solute molecules cross the cellular membrane.

A hypertonic solution is a particular type of solution that has a greater concentration of solutes on the outside of a cell when compared with the inside of a cell.

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Answer 2

(c) Hypertonic solution is the correct option.

• When compared to the solution inside the cell, the hypertonic solution has a higher solute concentration.
• Exosmosis occurs and the cell membrane contracts inward from the cell wall because the environment around the cell is hypertonic.
• The space between the cell membrane and the cell wall is filled with the same hypertonic solution that the cell was placed in since the cell wall is fully permeable.

(a) Isotonic solution- Incorrect

• The hypertonic solution is the one used in the question.
• An isotonic solution is one in which the solute concentration is the same as the solution found inside a cell.
• The cell's form will not change, and there will be no net movement of water into or out of the cell.
• As a result, this choice is incorrect.

(b) Hypotonic solution- Incorrect

• A hypotonic solution is the one in which the solution has a lower solute concentration compared to the solution inside the cell.
• So, instead of plasmolyzing, the cell will swell if a hypotonic solutions fills the space between the plasma membrane and the cell wall.
• Hence, this option is incorrect.

(d) Water- Incorrect

• There is no solute concentration in water.
• Since there is more solute inside the cell, water from the outside must enter to balance this and make the cell flaccid.
• In this instance, there is no space between the plasma membrane and the cell wall.

Hence, option (c) is the correct choice.