Edexcel IGCSE Biology · Spec 5.5-5.8
Microorganisms and Food
How microorganisms are used to make food and drink, including yoghurt and bread, using fermenters.
Biology revision video
Microorganisms and Food
Prefer to watch on YouTube? Open this video on YouTube.
Spec 5.5-5.8
What you need to know
- Describe the role of yeast in making bread
- Describe the role of bacteria in making yoghurt
- Explain how an industrial fermenter works
Active recall
Quick check
Answer each question before opening the answer.
What is the role of yeast in bread and in brewing?
Yeast respires anaerobically: the carbon dioxide makes bread rise, and the ethanol is used in brewing.
What is a fermenter used for?
Growing microorganisms under controlled conditions to make products such as yoghurt, penicillin or mycoprotein.
Biology video companion
Keep your notes and exam practice together
The free Biology workbook follows every video in specification order.