Name: Facilitated Diffusion: Transport in Plants
Uploaded: 2019-07-19
Duration: 18 min 2 s
Description: Facilitated diffusion occurs when important molecules pass through the membranes via special holes called channels. Watch the video to learn more.

Question

Write about plasmolysis and deplasmolysis.

Accepted Answer

In normal conditions, the cell sap presses the protoplasm against the cell wall. Plasmolysis is the shrinkage of protoplast from the cell wall due to exosmosis from plant cells. It occurs when a cell is placed in a hypertonic solution. It causes the outward movement of water from the cytoplasm and vacuole leading to the shrinking of the cell. When a plant cell is placed in a hypertonic solution, the plant cell loses water which reduces the turgor pressure and the cell gradually becomes flaccid.

For e.g., When some grapes are put in a dish full of concentrated sugar solution, it shrinks due to exosmosis and gets plasmolysed. The water movement from its cells occurs outward into the sugar solution making the cells turn flaccid and hence shrink.

Deplasmolysis:

If the plasmolysed cell is again immersed in hypotonic solution or in pure water, endosmosis takes place i.e., water from outside will enter into the cell which will gradually become turgid. This is deplasmolysis. Thus, the phenomenon of recovery of turgidity due to endosmosis of water is known as deplasmolysis.

Write about plasmolysis and deplasmolysis.

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