In the last practice of 1st ESO, in six tubes with some yeast in each one, we added:
a. Just the yeast (one teaspoon)
b. A pinch (a little bit) of sugar.
c. 10 ml of cold (tap) water.
d. A pinch of sugar and 10 ml warm water (about 35ºC)
e. A pinch of sugar and 10 ml boiling water.
f. A pinch of sugar and 10 ml cold water.
Which conditions do you think are the best?
Here are some results:
What are then your conclusions?