Sugar Fermentation


Objective– Yeast is one of the most used in kitchen which makes a dough rise. Have you seen a pizza crust or a bread bulge in the oven? What makes it possible is the Yeast, that makes it to expand. But how exactly the process takes place? Yeast consists of various number of living eukaryotic microbes having cells with nuclei. In this experiment you will observe yeast coming to life when it breaks down the sugar through the process of fermentation.


  • 3 glass cups
  • Teaspoons sugar- 2
  • Warm water cold water
  • Small dishes- 3 in number
  • A permanent marker


  1. Fill the three dishes with cold water of about 2 inches
  2. Place the glasses in each of the dish and then label them with numbers 1, 2, and 3.
  3. In the glass 1, mix 1 teaspoon of the yeast, and about one fourth cup of the warm water, and about two teaspoons of sugar.
  4. In the glass 2, mix about 1 teaspoon of the yeast with about one fourth cup of the warm water.
  5. In the glass 3, place about one teaspoon of the yeast in glass.
  6. Next observe the reactions in each of the cups. We observe that each of the reactions within the glasses differ from each other. This occurs due to the process of sugar fermentation of yeast.

Conclusion– Fermentation is one of the chemical processes which involves the breakdown of substance by microorganisms, bacteria, or yeast. The yeast microbes widely react differently in varying environments. The yeast present in the glass 1 was activated by the addition of sugar and warm water. The foaming mainly results from yeast eating up the sucrose. If the glass 1 smells, then the process of sugar fermentation gives heat and gas as one of the waste products.

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