Curriculum
Science — First Preparatory
Unit 1: Matter
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Unit 2: Forces
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Unit 3: Life
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Unit 4: Earth and Space
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Text lesson
Microbes
Microbes
Useful microbes
Useful microbes
Key points
Making yoghurtlactic acid bacteria convert milk sugar into lactic acid, which makes the milk thicken and gives yoghurt its taste.
Making breadyeast produces carbon dioxide gas as it ferments the dough, so the dough rises and the bread becomes light and soft.
Antibioticsthe mould Penicillium produces penicillin, which kills bacteria. It has saved the lives of many patients.
Soil fertilitysome bacteria living in the roots of legumes convert nitrogen from the air into compounds that plants can use.
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