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Living without Oxygen
Reference chapter
Question 1
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A large test tube containing same yeast and sugar solution was set up
as shown in the diagram below. The bubbles of gas produced were passed through
lime water (in the second test tube) by using a delivery tube.
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1. What would you expect to happen in the test tube containing lime water? |
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2. What does this observation tell us about the yeast in the test tube? |
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The number of bubbles of gas were counted. This was done with the water bath at six different
temperatures. The temperatures and the results are shown below: |
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Temperature
(°C) |
Number of bubbles per minute |
10 |
03 |
20 |
11 |
30 |
19 |
40 |
25 |
50 |
21 |
60 |
10 |
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3. Plot a graph of these results |
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4. What do the results show? (State your observations.) |
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5. Why do you think that the yeast in the test tube produces less and less
bubbles of gas as the temperature rises above 40°C? |
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© Paul Billiet & Shirley Burchill 2010
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