Defination of plasmolysis?

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When a plant cell is placed in a hypertonic solution the cell  organells will shrink  leaving the cell  wall   this is called plasmolysis

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Definition of Plasmolysis

Plasmolysis is a phenomenon that occurs in plant cells when they are placed in a hypertonic solution, causing the cell's protoplast to shrink away from the cell wall. This occurs due to the loss of water from the cell, resulting in the cell membrane pulling away from the cell wall.

Explanation of Plasmolysis

Plasmolysis involves several key steps and changes within the plant cell. Here is a detailed explanation of the process:

1. Hypertonic Solution:
Plasmolysis occurs when a plant cell is exposed to a hypertonic solution, which has a higher solute concentration compared to the cell's cytoplasm. This hypertonic solution creates an osmotic gradient that leads to water loss from the cell.

2. Water Loss:
As the plant cell is exposed to the hypertonic solution, water molecules within the cell move out of the cell through the process of osmosis. Osmosis is the movement of water molecules from an area of lower solute concentration to an area of higher solute concentration.

3. Cell Membrane Shrinkage:
As water is drawn out of the cell, the cell membrane starts to shrink away from the cell wall. The protoplast, which includes the cell membrane, cytoplasm, and organelles, begins to separate from the cell wall due to the decreased turgor pressure.

4. Plasmolysis Gap Formation:
The shrinking of the protoplast creates a gap between the cell membrane and the cell wall, which is known as the plasmolysis gap. This gap is filled with the remaining cytoplasm and organelles, as they retract away from the cell wall.

5. Effects on the Cell:
Plasmolysis can have various effects on the plant cell. The loss of water causes the cell to lose its turgidity, resulting in wilting and a flaccid appearance. The separation of the cell membrane from the cell wall can also disrupt important cellular processes and functions.

6. Reversibility:
Plasmolysis is a reversible process. If the plant cell is placed back in a hypotonic solution, which has a lower solute concentration compared to the cell's cytoplasm, water will enter the cell through osmosis. This influx of water will restore the turgor pressure and cause the protoplast to expand, returning the cell to its normal state.

In conclusion, plasmolysis is a cellular phenomenon that occurs when plant cells are exposed to a hypertonic solution, leading to the loss of water and the shrinkage of the protoplast away from the cell wall. It is a reversible process that can have significant effects on the plant cell's structure and function.

Answer

Plasmolysis is when plant cells lose water after being placed in a solution that has a higher concentration of solutes than the cell does. This is known as a hypertonic solution. Water flows out of the cells and into the surrounding fluid due to osmosis. This causes the protoplasm, all the material on the inside of the cell, to shrink away from the cell wall. Severe water loss that leads to the collapse of the cell wall can result in cell death. Since osmosis is a process that requires no energy on the part of the cell and cannot be controlled, cells cannot stop plasmolysis from taking place

Answer

When a living plant cell, looses water through osmosis there is shrinkage of contents of cell away from cell wall. This is known as plasmolysis.

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