Milk to Yogurt
Age 11 · Daily Life
Tiny living things called micro-organisms can change milk. They turn milk sugar into acid, making the milk thicker and tangier as yogurt.
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Age 11: open this week
Browse Age 11In the picture
- A glass jar of milk: fresh milk before micro-organisms act.
- A jar of thick yogurt: milk thickened and soured by fermentation.
- A magnified view inside the milk: round and rod-shaped micro-organisms among milk droplets.
Examples
- Yogurt made from milk
- Cheese made from milk
Key takeaways
- Micro-organisms can turn milk into yogurt.
- Fermentation helps preserve food and gives it new flavors.
Quiz: Milk to Yogurt (Age 11)
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Which of these does the card describe as tiny living things?
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What do micro-organisms turn milk sugar into when they make yogurt?
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What does fermentation do for food, according to the card?
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