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Osmosis

Osmosis is a special case of diffusion.


Osmosis involve the movement of water through a partially permeable membrane.


This means that only some substances can pass through the membrane.


Small molecules, such as water, can pass through but larger molecules
cannot.





Osmosis is water moving from a region where its concentration is high (in a dilute solution) to where its concentration is low (to a more concentrated solution).


Cell in Water
When you place a cell in water, water will enter the cell by osmosis.


The cell will become turgid or stiff.


Animal cells will swell up and burst if too much water enter the cell.


The strong cell wall stop plant cells from bursting when water enters them.


Cells in a Concentrated Solution
Water will leaves the cell by osmosis.


Animal cell will shrink


In plant cell, the strong cell wall will stay the same.


The inside of the cell shrinks away from the cell wall.


Cell is plasmolysed.