Pearson Edexcel IGCSE · Human Biology

Respiration: Practice Questions

5 multiple-choice questions marked as you go, and 1 written questions with worked solutions. All on Respiration.

6 questions9 marksFree, no account

Question 1

1 mark

Which of the following is the correct word equation for aerobic respiration in humans?

Question 2

1 mark

A student uses a respirometer to measure the rate of respiration in a small organism. If the student adds a chemical that absorbs carbon dioxide, what will happen to the volume of air in the closed system as the organism breathes?

Question 3

1 mark

Adenosine triphosphate (ATP) is the primary energy currency in human cells. During periods of intense physical activity, the rate of ATP hydrolysis increases significantly to provide energy for muscle contraction.

Which of the following statements correctly describes the role of ATP in energy transfer within the cell?

Question 4

1 mark

Which chemical is used to test for the presence of carbon dioxide when investigating the difference between inspired and expired air?

Question 5

1 mark

A student investigates the difference between inspired and expired air by breathing through a delivery tube into a flask containing limewater. After several breaths, the limewater in the flask turns cloudy.

Which statement correctly explains this observation?

Question 6

4 marks

During strenuous exercise, muscle cells may undergo anaerobic respiration. Write the word equation for this process in human cells and explain why it results in an oxygen debt.

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

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