Cambridge IGCSE Biology practice

Paper 3 structured question: Chemical digestion

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Paper

Marks

Topic

Chemical digestion

Exam-style question

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Paper 3Theory (Core)3 marks

Gastric juice contains hydrochloric acid which plays important roles in digestion.

Description

Hydrochloric acid helps protect the body and aids digestion in the stomach.

a
Identify one role of hydrochloric acid in killing microorganisms.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Describe how hydrochloric acid creates conditions for enzymes to digest food.
Your answer
Aim for approximately 2 distinct marking points.
[2]

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Paper 3Theory (Core)2 marks

Description

Hydrochloric acid is a component of gastric juice that helps in digestion.

a
Describe one role of hydrochloric acid in gastric juice related to microorganisms in food.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Describe one way hydrochloric acid helps enzymes in the stomach to digest food.
Your answer
Aim for approximately 1 distinct marking point.
[1]