Oxford AQA IGCSE · CORE Biology (9221)

Digestion: Practice Questions

5 multiple-choice questions marked as you go, and 2 written questions with worked solutions. All on Digestion.

7 questions12 marksFree, no account

Question 1

1 mark

In the human digestive system, which of the following best describes the role of the liver and gall bladder in the digestion of lipids?

Question 2

1 mark

In the process of digestion, different enzymes require specific conditions to function optimally. Which of the following correctly matches the enzyme, its production site, and the pH environment where it is most active?

Question 3

1 mark

A specific enzyme is responsible for breaking down proteins in the stomach. The activity of this enzyme is measured at different pH levels.
At which pH would this enzyme likely show its highest rate of reaction, and what is the name of this enzyme?

Question 4

1 mark

In the human digestive system, different organs work together as an organ system.
Which of the following correctly describes the interaction between the liver and the small intestine during the digestion of lipids?

Question 5

1 mark

Consider the digestive system as an organ system. In the small intestine, specific conditions are required for enzymes to function at their maximum rate.

How does the liver specifically contribute to creating these optimal conditions for enzymes produced by the pancreas?

Question 6

4 marks

In the human digestive system, the chemical breakdown of large, insoluble molecules is facilitated by enzymes. State the specific site of production and the optimal pH environment for protease enzymes acting in the stomach.

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

Question 7

3 marks

Explain how bile, produced by the liver and stored in the gall bladder, specifically aids in the digestion of lipids within the small intestine by its effect on surface area.

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

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