4. A student carried out an investigation into the effect of physical activity on respiration rate - Scottish Highers Human Biology - Question 4 - 2016
Question 4
4. A student carried out an investigation into the effect of physical activity on respiration rate.
The rate of respiration of six individuals was measured after car... show full transcript
Worked Solution & Example Answer:4. A student carried out an investigation into the effect of physical activity on respiration rate - Scottish Highers Human Biology - Question 4 - 2016
Step 1
State two variables which would have to be kept constant when setting up the apparatus shown in Figure 1.
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Answer
Temperature of the bottle and solution.
Volume of the pH indicator solution.
Step 2
Calculate the time taken for the indicator to turn yellow after individual 6 had completed Activity 1.
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Answer
The time taken for the indicator to turn yellow after individual 6 completed Activity 1 is recorded as 31 seconds.
Step 3
Describe how the student increased the reliability of the results.
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Answer
The student increased the reliability of the results by repeating the investigation with several individuals and taking an average for each activity.
Step 4
Construct a bar graph to show the average results obtained in this investigation.
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Answer
To construct the bar graph, plot the average times for each activity (33s for resting, 25s for walking, and 18s for running) on the Y-axis against the activity types on the X-axis. Ensure to label both axes appropriately.
Step 5
State a conclusion that can be drawn from the results of this investigation.
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Answer
Increasing physical activity increases the respiration rate.
Step 6
Suggest an explanation for the results obtained in this investigation.
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Answer
Increased respiration/activity produces more carbon dioxide. The body requires more ATP/energy during physical activities, leading to increased respiration effort.
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