Question

Fresh grapes shall shrink when they are placed in
A. Hot water
B. Cold water
C. Starch water
D. Concentrated salt solution

Answer 1

Exosmosis causes the liquid content of the cell to flow out. The cell membrane pulls away from the cell wall when the cell collapses (in plants). Plasmolysis is defined as the contraction of a cell membrane in a hypertonic fluid under high pressure.

Complete answer:
Plasmolysis is the loss of water by cells in a hypertonic solution. If the cell is in a hypotonic solution, deplasmolysis or cytolysis can occur, resulting in a reduced external osmotic pressure and a net flow of water into the cell.
When fresh grapes are placed in a strong salt solution, they shrivel because the salt solution is hypertonic in comparison to the sugar and water in the grapes. Because it is a hypertonic solution, it contains fewer solvent molecules than the fluid inside the cell. Exosmosis is the process by which solvent molecules are pushed outside the cell from a region of higher concentration to a region of lower concentration. Flaccidity develops in the cell.
As a result, option D is the proper response.
Plasmolysis happens only in extreme circumstances and is extremely rare in nature. In the lab, it's induced by submerging cells in saline or sugar (sucrose) solutions.

Therefore, the correct answer is option D.

Note:
Plasmolysis' Importance
1. Assists in comprehending the alive aspect of a cell.
2. Salting kills germs by plasmolysis, which helps to preserve meat, jellies, and pickles.
3. Used to demonstrate the permeability of the cell wall and the selective permeability of the plasma membrane.