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Cambridge IGCSE Biology practice

Paper 4 structured question: Absorption

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4

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2

Marks

Topic

Absorption

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Paper 4Theory (Extended)2 marks

The small intestine absorbs nutrients from digested food.

Description

Structure of the small intestine lining

The lining has many villi covered with microvilli, increasing surface area for absorption.

  1. a

    Identify two ways villi and microvilli help absorption in the small intestine.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Absorption

Paper 4Theory (Extended)4 marks

Diagram Description

Diagram of a villus in the small intestine

The diagram shows a villus with many microvilli on its surface, blood vessels inside, and a thin wall.

  1. a

    Explain how villi and microvilli increase the internal surface area of the small intestine and how this helps absorption.

    Aim for approximately 4 distinct marking points.

    [4]