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Bacteria & VirusesActivity for Kids

Grow Mold DIY

Duration: 20 min
Difficulty: Easy
Cost: $0 to $10

Learn how to grow mold!

Visit The Full Lesson Download Instructions as PDF

Material List

2Slices of bread
2Sealable plastic bags
1Roll of tape
1Marker
1Spray bottle

Instructions

1Spray 3 squirts of water on each slice of bread.
2Write “COOL” on one bag, and “WARM” on the other.
3Add the pieces of bread to each bag.
4Close the bags and tape the seals airtight.
5Put the bag labeled “COOL” in the fridge.
6Put the bag labeled “WARM” somewhere warm and dark, like a kitchen cupboard.
7Let the bags sit there for 1 week then observe!
8When done keep the bag sealed and throw it away.
CautionAdult supervision is suggested.

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How It Works

Like bacteria, fungi are also microbes. Fungi include yeast, mushrooms, and mold. Cold temperatures slow the growth of microbes, which is why we have refrigerators. Things last longer in the fridge because bacteria and fungi grow slower in the cold. This is why the “COOL” bread doesn’t grow mold over a week, while the “WARM” bread does.