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Abstract
This activity turns a classic student observation activity of yeast generation of gas into a guided inquiry lab. Rather than give the students one sugar, we give them a range of foods to taste for developing hypotheses based upon their analyses of the foods. The students then design the experiment with appropriate controls and carry it out using gas generation in a closed system with balloon to measure yeast fermentation.

Intended Audience
Grades K-4

Learning Objectives
At completion of this activity, the learner will be able to:
1. Describe the scientific method and how it is utilized to design experiments.
2. Describe how humans use microorganisms in their daily lives.
3. Utilize the scientific method to determine which foods cause yeast to produce carbon dioxide (CO2) more effectively.

Necessary Student Background
Students should be understand three of the states of matter: solid, liquid and gas. Students should be familiar with the scientific method. They should know what an experiment is and what results are. Students should be aware of the differences between living and nonliving things.

Keywords
Scientific method, critical thinking, inquiry based activity, fermentation, growth, yeast, sugar, metabolism

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Which Food Does Yeast Like Best?

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