Plasmolysis in Onion Epidermal Cells - Biology Lab Techniques

This video describes how to observe plasmolysis (cytoplasm retracting from the cell wall when the cell looses water) in onion epidermal cells.
-- CREDITS --
Demonstrator: David C. (Grade 9)
Producer: Dr Guillaume Erard ‪@guillaumeerard‬
Music: Reminisce by A Himitsu / a-himitsu Creative Commons - Attribution 3.0 Unported- CC BY 3.0
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#plasmolysis #osmosis #science

[@olive5392]

thanks! very helpful!

[@emmanueleliacin5168]

good video

[@nanu1793]

1:53 why?
why it happens in some cells and not in others?
shouldn't it happen to all cells since all are exposed to the same condition?

[@reborn1131]

some cells are not exposed to enough iodine, therefore those 'some' cells show plasmolysis but can simply just not be seen.

[@biologylab]

The repartition of water is not necessarily all or nothing. It depends on the osmotic potential of the solution. An iso-osmotic solution will cause about 50% of cells to appear plasmolyzed.