Question

Choose the correct sequence of events, when the plant wilts.
A. Exosmosis, deplasmolysis, temporary and permanent wilting.
B. Exosmosis, Plasmolysis, temporary and permanent wilting.
C. Endosmosis, Plasmolysis, temporary and permanent wilting.
D. Endosmosis, deplasmolysis, temporary and permanent wilting.
E. Exosmosis, deplasmolysis , Plasmolysis, temporary and permanent wilting.

Answer 1

Hint: Wilting is the loss of rigidity of non-Woody parts of the plant mainly due to the loss of water in leaves ,when the turgor pressure of the cell falls to zero. It mainly occurs in non – lignified cells, since presence of lignin in the cell prevents the outward flow of water.

Complete answer:
Turgor pressure is the force exerted by the cell wall due to the plasma membrane.There are two types of solution, hypertonic solution and hypotonic solution. In hypertonic solution, the concentration of solute is more and the solvent is less. In a hypotonic solution, the concentration of solute is less and the solvent is more.

Osmosis is the movement of water molecules from the region of low concentration to the region of high concentration through a semipermeable membrane. There are two types of osmosis, Endosmosis And Exosmosis . When a cell is placed in a hypertonic solution, the water from the cells moves outwards. This process is known as Exosmosis . When a cell is placed in a hypotonic solution, the water from the solution moves into the cell , this process is known as Endosmosis.

When a cell is placed in a hypertonic solution, the process of Exosmosis takes place and the cell loses water and this results in loss of turgor pressure. The protoplasm is peeled off from the cell wall. This process is known as Plasmolysis. It can be reversed. When the Plasmolysed cell is placed in a hypotonic solution, the process of Endosmosis takes place and the water moves from the solution into the cell . The protoplasm regains its original shape and the turgor pressure is increased. This process is known as deplasmolysis. Plasmolysis leads to the Wilting of plants .
The correct sequence of writing in plants is Exosmosis, Plasmolysis, temporary and permanent wilting.

Hence, the correct answer is option (B).

Note: There are two types of Wilting permanent or temporary Wilting. In permanent Wilting, the plant never regains its shape once water is applied in the soil. In temporary Wilting, the plant regains its original shape after the application of water in soil. Wilting helps the plant to prevent water loss during the winter season by offering less leaf surface area to plants.