Osmosis in plant tissue (required practical)

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Biology

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19 Terms

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Osmosis
The diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane
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Dilute solution
A solution that contains a relatively small amount of dissolved solute
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Concentrated solution
A solution that contains a relatively large amount of dissolved solute
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Solute
A dissolved substance in a solution such as glucose or salt
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Partially permeable membrane
A membrane which allows some substances through but not others
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Turgidity
When a plant cell is swollen due to the movement of water into the cell
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Flaccid
When water moves out of the plant cell causing the cell to change shape and the vacuole to shrink
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Plasmolysed
When water has completely moved out of plant tissue by osmosis and the vacuoles are empty
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Molarity
The amount of substance in a certain volume of solution
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Percentage change
The amount of change divided by the original value multiplied by 100
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Cork borer
A device used to make plant tissue cylinders of the same diameter
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Mass
The measure of the amount of matter in an object measured in grams or kilograms
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Top pan balance
A set of scientific measuring scales with an exposed pan
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Surface moisture
The moisture covering the surface of the plant tissue that must be removed to ensure valid results
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Distilled water
Water that has been evaporated and condensed and contains no dissolved solutes
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The concentration of solution
The independent variable or factor that is changed in this experiment to investigate the effect of osmosis in plant tissue
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The mass or length of plant tissue
The dependent variable or factor that is measured in this experiment to investigate the effect of osmosis in plant tissue
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Temperature, time, plant tissue diameter, volume of solution
The variables that are controlled to ensure the experiment is a fair test
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Expected results
Plant material such as potato chips kept in dilute solutions will increase in mass or length, plant material kept in concentrated solutions will decrease in mass or length