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Living
without Oxygen
Reference
chapter
Question
1
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PDF version
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.
| 1. What
would you expect to happen in the test tube containing lime water? |
| 2. What
does this observation tell us about the yeast in the test tube? |
| 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: |
|
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 |
| 4. What
do the results show? (State your observations.) |
| 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 2008 |
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