Basic science: understanding experiments
Basic science: understanding experiments

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3.1 Experiment 4: Yeast experiment

Figure 1

Living organisms, like yeasts, need food and oxygen in order to survive and thrive. In this experiment, you will test some conditions that can affect their growth. What variables might you be able to change in this experiment?

You will add the living yeast organisms to sugary solutions at different temperatures. You will also cover one glass of your sugary solution with cling film.

To carry out this experiment, you will need:

  • four glasses
  • four sachets of baker’s yeast
  • sugar
  • water
  • a kettle
  • a marker pen
  • cling film
  • your activity booklet [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] .

As with experiments in the previous weeks, you will want to carry this out somewhere that it won’t be disturbed by family members or pets. The experiment shouldn’t take more than half an hour or so to carry out, so you won’t need to be vigilant for too long.

What results do you expect to see in this experiment? Try to write down a hypothesis that you will be testing.

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