Delivery tube
test-tube
boiling
tube
thin layer
of oil
10.3
To find out whether carbon dioxide is given
off during fermentation
Add a few grains of dry yeast to some
1
distilled water in a boiling tube. Stir well.
2 After 20 minutes, add an equal volume of
dilute glucose solution to the yeast
suspension and mix well. Add a little oil.
3 What does the layer of oil serve as?
4 What do you observe after some time?
Explain your answer.
lime water
glucose
and
yeast
suspension
5
What would you add to the boiling tube in a
control experiment?