I guess the lettuce leaf cells had a higher salt concentration than your saline solution. Your solution could also have been diluted immensely somehow.

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toni_malvina

wrote...

12 years ago

water from inside the lettuce leaf cells passed through the cell membrane to dilute the saline solution.

That is the principle of osmosis. Water flows from a region of low solute concentration to one of high to dilute the high.
http://en.wikipedia.org/wiki/Osmosis

Reverse osmosis is the opposite. You have a stream of high salt concentration under very high pressure to overcome osmotic pressure. And it forces water backwards. From the stream of high salt concentration to the pure stream.
http://en.wikipedia.org/wiki/Reverse_osmosis

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I see alyssabff has created a second account given herself a thumbs up and me a thumbs down. Too bad. That just shows how missinformed she is.

WATER passes through the cell water from the side of LOW salt concentration to HIGH salt concentration to drive the concentration of salt down. It is a well known process. OSMOSIS. The pressure behind the drive is called osmotic pressure

GOOGLE!

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