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Sharhea's picture

Onion Experiment (Shanika n Sharhea pt.2)

Submitted by Sharhea on Thu, 10/04/2007 - 2:47pm.
As we observed the experiment that Will performed, we saw man reactions. The color of one the cell membranes changed as time went by. *One drop of the salt: the purple is fading at the edges according to our view with the microscope*Second drop of salt: more of the cells continued to fade. The membranes located on the outer sphere faded first, probably because they got more of a direct contact with the salt first. The ones in the middle took more time to fade. One of the membranes totally faded out.*Third drop of salt and so on: fading at the same rate as the other twoGaps are created that allowed the cell membrane to pull away from the cell wall. Once we added water the cell membranes expanded *Salt water=shrinkage*Water=expandThe onion membranes behaved like a sponge. When salt water was dropped on it, it shrunk. When pure water was dropped on it, it expanded. Technically, we didn’t observe this ourselves but with Will’s experiment on the board.

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