Learning objective

Explain the roles of hydrochloric acid in gastric juice, focusing on its ability to kill harmful microorganisms in food and create an acidic environment for optimal enzyme function.

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Exam focus

Cambridge IGCSE BiologyHuman nutritionCore content

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Quick explanation

This point belongs to Chemical digestion, especially Chemical digestion outcomes.
You need to be able to explain the roles of hydrochloric acid in gastric juice, focusing on its ability to kill harmful microorganisms in food and create an acidic environment for optimal enzyme function.
The key ideas to know are Describe.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Describe

Why it matters

This objective helps connect Chemical digestion outcomes to exam-style questions, flashcards, and revision notes for Chemical digestion.

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Flashcards10 linked cards

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Practice Questions7 linked questions

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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]

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