Standard Science Primary 3 Diversity

Luke added yeast to dough when baking bread. He noticed the dough rose and became bigger. Why did this happen?

A The yeast makes the flour expand.
B The yeast is a living thing that produces gas.
C The yeast adds water to the dough.
D The yeast is a plant that grows.
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Worked Solution

Step 1: Yeast is a micro-organism (fungus). Step 2: Like all living things, it carries out processes (respiration/fermentation). Step 3: This process releases carbon dioxide gas, which gets trapped in the dough and causes it to rise.

Correct answer: The yeast is a living thing that produces gas.

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