• Gloria Hoffner

Observe cells in action

Experiments: How do cells exchange liquids? Materials: Ice tea glass, teaspoon of salt, warm water, parchment paper, rubber ban, plate and food coloring. Process: Fill the glass with warm water. Stir in the teaspoon of salt, making sure it dissolves. Cover the top of the glass with parchment paper and secure tightly with a rubber ban. Place food coloring to the edges of the plate. Turn the glass upside down onto the plate.

Result: Observe as both the water and the food coloring in the plate become the same color. This happens because tiny molecules of water and food coloring are exchanged between the pores in the parchment paper. This presents how all living cells exchange liquids through a surrounding permeable membrane osmosis.


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