Oxford AQA IGCSE · Biology (9201)

Respiration: Practice Questions

3 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Respiration.

6 questions18 marksFree, no account

Question 1

1 mark

Where do most of the chemical reactions involved in aerobic respiration take place within an animal cell?

Question 2

1 mark

During vigorous exercise, the human body may undergo anaerobic respiration if insufficient oxygen reaches the muscles. Which of the following statements correctly describes this process in muscle cells?

Question 3

1 mark

During vigorous exercise, the body may perform anaerobic respiration. Which of the following statements correctly compares the energy transfer and products of anaerobic respiration in human muscle cells versus yeast cells?

Question 4

5 marks

During vigorous exercise, muscle cells may undergo anaerobic respiration. Explain why an oxygen debt is created and how the body eventually repays this debt after exercise has ceased.

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Question 5

5 marks

Aerobic respiration is a vital chemical process that occurs continuously in cells.

a) Write the balanced symbol equation for aerobic respiration. (2 marks)

b) Name the cellular organelle where most of the reactions of aerobic respiration occur. (1 mark)

c) State two ways in which the energy transferred during respiration is used by a mammal. (2 marks)

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Question 6

5 marks

During vigorous exercise, the human body undergoes several physiological changes to meet the increased demand for energy.

a) Explain how the heart rate and breathing rate changes help the muscles during exercise. (2 marks)

b) If insufficient oxygen reaches the muscles, anaerobic respiration occurs. Write the word equation for anaerobic respiration in muscle cells. (1 mark)

c) Explain why a person continues to breathe deeply for several minutes after they have finished exercising. (2 marks)

Write your answer out first, then check it against the worked solution.

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