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Living without Oxygen : 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.

 

Yeast Experiment Apparatus

 

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

3. Plot a graph of these results

Graph Paper

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?