Find a way to find out which substances can serve as food for yeast. Try, for example, sugar, starch, flower fertilizers, gelatin, vegetable oil.

To find out what substances are food for yeast, you can put down experiments with different media: sugar, starch, gelatin, vegetable oil, flower fertilizers. We put a yeast culture in each nutrient medium, put it in a warm place and after a few days we will see the results – foaming will be a sign of the yeast’s vital activity (nutrition). For persuasiveness, you can take a drop of liquid on a glass slide and examine it under a microscope and see the yeast colonies. Only in an environment where there is sweetness – sugar, will yeast multiply, because eat carbohydrates – sugars.