# Explain how yeast is used in the production of bread.

> WJEC GCSE Biology (Wales) — 2.7 Micro-organisms and their applications · Explain · 4 marks

## Mark scheme (4 marks)

1. Yeast carries out anaerobic respiration / fermentation
2. Yeast breaks down / respires sugars / glucose
3. Carbon dioxide is produced / released
4. Carbon dioxide causes the dough to rise / makes the bread light

## Key terms

- [yeast](https://www.gradenine.co.uk/glossary/yeast)

## Related

- [Revision notes for WJEC GCSE Biology (Wales)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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Source: [GradeNine](https://www.gradenine.co.uk/q/explain-how-yeast-is-used-in-845bc0ac) · Published by Druglandscape Ltd.