The Effect of Temperature on the Rate of Respiration in Yeast

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The Effect of Temperature on the Rate of Respiration in Yeast

Preliminary Experiment

Aim

To investigate the time it takes for the yeast in glucose suspension

to reach the same temperature as the water it is placed in.

Apparatus

=========

· Stopwatch

· Plastercine

· 2 Thermometers

· Ice Cream Tub

· Kettle

· Syringe

Method

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· First I will fill up the ice cream tub with water at one of the

temperatures I would be using for the main experiment (80degrees will

be tested)

· Next I will check the temperature of the yeast in the syringe and

record it. The end of the syringe will be covered with plastercine so

none of the yeast will come out.

· Then I will place the syringe with a thermometer in it into the

water. The stopwatch will then be started.

· Every 30seconds the temperature of the water and the temperature of

the yeast will be recorded.

· When the water and the yeast reach the same temperature the

stopwatch will be stopped and the time taken will be recorded.

Prediction/reasoning

====================

I predict that the higher the temperature of water the longer it will

take for the yeast to reach that temperature. As the time goes on the

temperature of the water will drop quicker. This is because the water

cannot stay at a high temperature for a long period of time.

Preliminary Experiment Results

==============================

Time Taken in seconds

Temp. of Water (in degrees)

Temp. of Yeast (in degrees)

20

80

41

50

78

44

80

78

47

110

75

50

140

72

54

170

70

55

200

70

56

230

68

57

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