Yeast, the destroyer

 Yeast is useful fungus because it helps to make bread rise and is used to make fizzy drinks such as ginger beer. Yeast is called a decomposer because it breaks things down. You can watch yeast decompose a banana.

Peel a banana and slice it in half. Put one slice in a jar and sprinkle dry yeast over it. Put the other slice in another jar. Sprinkle both bananas with little water. Cover the jars with a cloth and place the jars in warm place.Keep for a few days and watch what happens.

What happens to the banana with yeast added?

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