The Dandelion Experiment

The Dandelion Experiment - forces the protoplasm to push...

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The Dandelion Experiment Dandelion stalk in salt-water solution. Dandelion stalk in H2O. Observations : The stalk in the salt-water solution became limp and shrunk in diameter. The stalk in H20 felt firmer and the diameter of the stalk seems to have increase. The cut ends of the stalk also curled outward when placed in water. Discussion : In the H2O solution, water passes through the semi-permeable membrane of the stalk by traveling from high to low concentration, a process known as osmosis. The high volume of H2O in the cell increases pressure, which in turn
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Unformatted text preview: forces the protoplasm to push against the cell wall. The turgor of the stalk is what caused the cut ends to curl outward. The addition of salt makes the solution hypertonic, meaning theres a greater concentration of NaCl ions outside of the stalk that can pull water away from the cell. The flaccid stalk loses a large amount of H2O, which in turn leads to plasmolysis, a point where the decrease in pressure of the protoplasm cause the cell wall to collapse. The collapse of the cell wall explains why the stalk felt limp and decreases in diameter....
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This note was uploaded on 10/27/2010 for the course D 05540 taught by Professor Hoffman during the Spring '10 term at UC Irvine.

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