Standard Science Primary 3 Diversity

Why are some bacteria considered useful to humans?

A They make us fall sick.
B They are used to make plastic.
C They cause food to rot.
D They help in making yogurt.
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Worked Solution

Step 1: Not all bacteria are harmful. Step 2: Certain bacteria are used in food production (fermentation). Step 3: Making yogurt and cheese are examples of useful bacterial activity.

Correct answer: They help in making yogurt.

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