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13 Cards in this Set
- Front
- Back
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Investigating the uptake of oxygen in respiring organisms- germinating seeds (diagram) |
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Investigating the uptake of oxygen in respiring organisms- germinating seeds
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-germinating seeds placed in a test tube -as they use up oxygen for respiration, level of liquid in the delivery tubing will go up |
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What respiring organisms can you use in the investigation of the uptake of oxygen (respiration investigation)? |
-germinating seeds -arthropods |
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How does a respirometer work? |
measuring the rate of reaction by seeing how quickly oxygen is taken up |
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Why is soda lime used in the investigation of the uptake of oxygen in respiring organisms? |
-organisms usually give out as much carbon dioxide as they take in oxygen -so there may be no total change in the total amount of air in the test tube -soda lime will absorb carbon dioxide |
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Why are the test-tubes kept in a water bath in the investigation of the uptake of oxygen in respiring organisms? |
-small changes in the temperature will make air in the test-tube contract or expand -causing the liquid to rise or fall, even if respiration is not taking place -temperature of water changes far more slowly than that of air in a water bath |
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Drawbacks of investigation of the uptake of oxygen in respiring organisms |
-small change in temperature will result in expansion or contraction of air, which will cause the liquid level to rise or fall even if respiration isn't taking place -living organisms give out as much carbon dioxide as they take in oxygen, resulting in no change in the total amount of air in test-tube |
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Investigating the uptake of oxygen in respiring organisms- arthropods (diagram)
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Time is always recorded in |
seconds (s) |
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Safety features to include in practicals |
-hair tied back -goggles -use tongs |
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When making comparisons remember to |
always REFERENCE BOTH of the things you're comparing |
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Plot discontinuous variation on a (discontinuous variation has no intermediates) |
BAR CHART -neat lines; ruler used and columns of equal width -scale; to fill greater than half of grid and to be even -axes; orientation and labels |
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Collecting leaves for an experiment, improvements made could be: |
-larger sample size -similar size of leaves -collect leaves from same height on tree -leaves from same specie of tree |
