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Cambridge IGCSE Biology practice

Paper 4 structured question: Chemical digestion

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Attempt questionChemical digestion revisionRevise the key idea

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Chemical digestion

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Paper 4Theory (Extended)2 marks

Digestion of starch involves enzymes that break it down into simpler sugars for absorption.

Description

Starch Digestion

Starch is a carbohydrate that is digested in the digestive system by enzymes. Amylase breaks starch down into maltose. Maltase then converts maltose into glucose at the surface of the small intestine's epithelial lining.

  1. a

    Describe how starch is digested in the digestive system.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Chemical digestion

Paper 4Theory (Extended)3 marks

Diagram Description

Enzymes in Starch Digestion

A diagram shows starch molecules being broken down by amylase into maltose, and maltose being broken down by maltase into glucose at the small intestine lining.

  1. a

    Identify the enzyme that breaks starch down into maltose.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe the role of maltase in starch digestion.

    Aim for approximately 2 distinct marking points.

    [2]