Osmosis in plant tissue (required practical): Cell biology: Biology: GCSE (9:1)

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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

<p>The diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane</p>
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Dilute solution

A solution that contains a relatively small amount of dissolved solute

<p>A solution that contains a relatively small amount of dissolved solute</p>
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Concentrated solution

A solution that contains a relatively large amount of dissolved solute

<p>A solution that contains a relatively large amount of dissolved solute</p>
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Solute

A dissolved substance in a solution such as glucose or salt

<p>A dissolved substance in a solution such as glucose or salt</p>
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Partially permeable membrane

A membrane which allows some substances through but not others

<p>A membrane which allows some substances through but not others</p>
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Turgidity

When a plant cell is swollen due to the movement of water into the cell

<p>When a plant cell is swollen due to the movement of water into the cell</p>
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Flaccid

When water moves out of the plant cell causing the cell to change shape and the vacuole to shrink

<p>When water moves out of the plant cell causing the cell to change shape and the vacuole to shrink</p>
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Plasmolysed

When water has completely moved out of plant tissue by osmosis and the vacuoles are empty

<p>When water has completely moved out of plant tissue by osmosis and the vacuoles are empty</p>
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Molarity

The amount of substance in a certain volume of solution

<p>The amount of substance in a certain volume of solution</p>
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Percentage change

The amount of change divided by the original value multiplied by 100

<p>The amount of change divided by the original value multiplied by 100</p>
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Cork borer

A device used to make plant tissue cylinders of the same diameter

<p>A device used to make plant tissue cylinders of the same diameter</p>
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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

<p>A set of scientific measuring scales with an exposed pan</p>
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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

<p>Water that has been evaporated and condensed and contains no dissolved solutes</p>
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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