This video shows the process of osmosis in red onion cells. The onion slide was initially made using distilled water (a hypotonic solution). A concentrated salt water solution was then added by placing drops along the edge of the cover slip.
As the salt diffused under the cover slip, the onion cells began losing water by plasmolysis as the solution became hypertonic.
![](https://s2.save4k.ru/pic/53yynsy0u0E/maxresdefault.jpg)