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2.2 Animal tissues, organs and organ systems

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Question 43
F

A group of students investigated how the type of exercise affects breathing rate. Each student counted the number of breaths they took in one minute while sitting still. Each student then chose one type of exercise, did it for three minutes, and counted their breaths for one minute immediately afterwards.

a.

Give the independent variable in this investigation.

[1]
b.

Give two variables the students should control.

[2]
c.

One student recorded 68 breaths in one minute after exercising. Every other student recorded between 20 and 30 breaths per minute.

Suggest what the students should do about this result.

[2]
d.

Explain why breathing rate increases after exercise.

[2]
Markscheme

2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems

179 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.

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