Cambridge IGCSE · Biology (0610)

Absorption: Practice Questions

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

10 questions25 marksFree, no account

Question 1

1 mark

Which part of the human alimentary canal is the primary site for the absorption of most digested nutrients and water into the blood?

Question 2

1 mark

Which part of the human alimentary canal contains the highest density of microvilli to maximize the rate of absorption?

Question 3

1 mark

Which row correctly identifies the primary destination for the listed nutrients after they cross the epithelium of a villus?

Question 4

1 mark

Which part of the digestive system is the main region for the absorption of digested nutrients?

Question 5

1 mark

A student observes a micrograph of a villus. The image height of the villus is measured as \(12\) mm. If the actual height of the villus is \(400\) \(\mu m\), what is the magnification used?

Question 6

2 marks

State the name of the tissue layer, often only one cell thick, that forms the outer surface of a villus through which all nutrients must pass during absorption.

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Question 7

3 marks

Explain how the epithelium of a villus being only one cell thick aids in the efficient absorption of digested food molecules.

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Question 8

6 marks

The small intestine is highly adapted for absorption through multiple levels of folding. Distinguish between the structural contributions of villi and microvilli in this process.

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Question 9

5 marks

(a) State the region of the human digestive system where most digested nutrients are absorbed.
(b) Describe the structural adaptations of a villus that increase the efficiency of nutrient absorption.
(c) Explain the specific roles of the capillaries and lacteals found within the villi during the absorption process.

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Question 10

4 marks

The small intestine is approximately 5 meters long in an adult human.
(a) Explain why the length of the small intestine is a structural advantage for the process of absorption.
(b) Distinguish between villi and microvilli in terms of their size and their specific location in the ileum.
(c) Suggest how a high-fiber diet might affect the total time available for absorption as material moves through the alimentary canal.

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