Advanced Science Primary 3 Diversity

Alexa helped her mother bake bread. They added yeast to the dough and left it in a warm place. The dough doubled in size. This is because yeast __________.

A is a living thing that reproduced and produced gas
B is a plant that grew bigger
C is a non-living powder that expanded in the heat
D is a bacteria that ate the flour
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Worked Solution

Step 1: Yeast is a single-celled fungus (living thing). Step 2: In warm conditions with food (sugar/flour), it reproduces and releases carbon dioxide gas. Step 3: The gas bubbles cause the dough to rise.

Correct answer: is a living thing that reproduced and produced gas

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