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Milk to Yogurt

Tiny living things called micro-organisms can change milk. They turn milk sugar into acid, making the milk thicker and tangier as yogurt.

In the picture

  1. A glass jar of milk: fresh milk before micro-organisms act.
  2. A jar of thick yogurt: milk thickened and soured by fermentation.
  3. A magnified view inside the milk: round and rod-shaped micro-organisms among milk droplets.

Examples

  • Yogurt made from milk
  • Cheese made from milk

Quiz: Milk to Yogurt (Age 11)

  1. Which of these does the card describe as tiny living things?

    • Acid
    • Milk sugar
    • Micro-organisms
  2. What do micro-organisms turn milk sugar into when they make yogurt?

    • Acid
    • Water
    • Salt
  3. What does fermentation do for food, according to the card?

    • It makes all food taste exactly the same
    • It helps preserve food and gives it new flavors
    • It makes food go bad more quickly

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.

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Daily Life, Age 11