Page 27 - 新思维科学学生用书8 样章

1 Respiration

Continued

Method
1 Set up your apparatus thermometer
100 100
as shown in the diagram. 90 90
Take care to make 80 70 80 70
everything exactly the cotton wool 60 60
50 50
same in each piece of 40 40
apparatus. The only 30 20 30 20

difference is that one flask 10 0 10 0
flask contains dead peas, insulating
and the other flask material
wrapped
contains live, round the
germinating peas. outside
2 Measure the temperature
inside each flask. dead peas live, germinating peas
Record it in a results chart.

3 Continue to measure and record the temperature at regular intervals. For
example, you could do this every hour during the school day.
4 Display your results as a line graph.

• Put time in hours on the horizontal axis.
• Put temperature in C on the vertical axis.
°
• Plot the points for the live peas as neat crosses. X
• Plot the points for the dead peas as dots with a circle around them.
• Join the points for each set of peas with ruled, straight lines between the

points.
Questions

1 What was the variable that you changed in this experiment?
2 Which variables did you keep the same?
3 Which variable did you measure?
4 Suggest an explanation for your results.

5 If you did the experiment again, would you expect your results to be exactly the
same? Explain your answer.
6 Suggest any improvements you would make to your experiment, if you were
able to do it again. Explain why each of your suggestions would improve your

experiment.

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