Study of Plasmolysis in the Epidermal Peel

Ans. It is a process wherein the protoplasm of the plant cell contracts or shrinks when placed in a hypertonic solution due to exosmosis resulting in the decline in the tension of the cell wall. This occurs at very extreme conditions in nature but can be induced in laboratories to demonstrate the process.

Ans. Incipient plasmolysis is the initial phase of plasmolysis wherein the water starts flowing out of the cell and the cell shrinks in volume and slowly starts detaching from the cell wall making it identifiable. In the initial stage of incipient plasmolysis, only a slight amount of water has moved out of the vacuole. This initial water loss is not enough to cause a significant change in the overall cell shape. However, it does lead to a cell membrane detachment from the cell wall at some points.

Ans. Osmotic pressure is a pressure that checks the osmosis process. It is defined as the minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane. It is a colligative property and depends upon the concentration of solute particles in the solution.

Ans. The importance of plasmolysis are as follows:

• It is extremely important as it helps to explain the process of Osmosis
• It demonstrates the permeability of the cell wall and the semipermeable nature of the cell membrane
• It helps to determine which particular cell is living or dead
• Plasmolysis occurs under extreme conditions. When there is a partial detachment of the protoplasm from the cell wall, the plant immediately recognises the issue, resolves it by receiving more water from its roots, and prevents further loss of water through perspiration.
• It also plays a significant role in food preservation and storage as salt and sugar are added to various food items like meat, jams, jellies, etc to increase their self-life.
• The concept of plasmolysis is also used in weedicides to kill weeds in lawns, orchards, and agricultural fields.

Ans. Turgor pressure is the pressure that presses the plasma membrane against the cell wall. It is a hydrostatic pressure that arises within the cell as a result of endosmosis on the cell wall. It is usually caused by the osmotic flow of water through a selectively permeable membrane.

Ans. The turgor pressure on the rigid walls of the cells causes exerting equal pressure in the opposing direction. This is termed as wall pressure. When the cell wall is stretched fully due to turgidity it exerts a counter pressure onto the fluid contents of cell which is called as wall pressure. At a turgid condition the turgor pressure is equal to that of the wall pressure.

Ans. Rhoeo leaves are used in this experiment because the cell sap is already coloured and is clearly visible under the compound microscope which makes the experiment easier and simple to execute. During plasmolysis, as the cell shrinks due to water loss, the coloured sap also shrinks, making the effect visually clear. Rhoeo plants are readily available in many regions and are relatively easy to grow and maintain. 

Ans. The types of Plasmolysis include

• Concave Plasmolysis: In concave plasmolysis, the cell membrane and the cytoplasm shrink and it begins to detach itself from the cell wall. This is a reversible process done by placing it in a hypotonic solution which helps the cell to regain the lost water content.
• Convex Plasmolysis: In this type, the cell membrane and the cytoplasm completely detach from the cell wall due to a higher loss of water. This results in the cell wall collapsing, resulting in the complete destruction of the cell. This type of plasmolysis is irreversible and is considered to be more complex than Concave Plasmolysis.

Ans. Deplasmolysis is the reverse of plasmolysis. The plasmolyzed cell when placed in a hypotonic solution swells up as water starts flowing into the cell vacuole and becomes turgid which is termed as deplasmolysis. As the water permeates into the cell it leads to the increase in the protoplast volume leading to the restoration of full turgidity of the cell.

Ans. (1) Turgid

Explaination: Distilled water has a very low concentration of solutes but a high concentration of solvents as compared to the cell sap. Hence the cell swells up and becomes turgid as the water moves into the cell.

Ans. The stages of plasmolysis are divided into three stages:

• Incipient Plasmolysis: In this first stage, the water moves out of the cell, the volume of the cell decreases, and the cell wall is evident.
•  Clear Plasmolysis: In this stage, the cell wall has peaked its limits of contraction, the cytoplasm is detached from the cell wall and has become spherical in shape
• Final Plasmolysis: In this particular stage, the cytoplasm is completely free from the cell wall and is in the centre of the cell.

Ans. The difference between plasmolysis and deplasmolysis are as follows:

Ans. Some common examples of plasmolysis are as follows:

• Shrinkage of blood cells and vegetables when it is placed in hypertonic conditions.
• During extreme coastal flooding, salt is deposited on the land by the ocean.
• Plasmolysis helps prevent unwanted plants by salting solution.
• Chemical weedicides are used to kill weeds in agricultural fields and lawns.

Ans. The uses of plasmolysis in daily life are as follows;

• The process of plasmolysis involves salting vegetables or pickles. When vegetables are submerged in a concentrated salt solution, they lose water, which helps preserve the food for longer durations.
• It helps cure meat with salt, which draws water from cells in the meat and inhibits bacterial growth that can cause spoilage.
• Plasmolysis is used in irrigation practices for plants. Farmers and gardeners can ensure they provide the right amount of water to maintain healthy plant growth and avoid excessive wilting by understanding how water moves in and out of plant cells.

Ans. The factors affecting plasmolysis are as follows:

• Cell Wall 
• Protoplasmic Viscosity
• Species of Cell
• Cell Wall
• Size of pore