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?

The condition in which joints are inflamed is bursitis select the best answer from the choices provided ot f

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

Use this dichotomous key for insect identification to identify the insect shown. 1. a. insect has one pair of wings. order diptera b. insect has two pairs of wings. go to #2 2. a. front wings thicker in texture than hind wings go to #3. b. front and hind wings are same texture throughout. go to #4 3. a. front wings are short order dermaptera b. front wings cover entire abdomen order coleoptera 4. a. wings with scale on all parts of their area. order lepidoptera b. wings without scales go to #5. 5. a. hind wings smaller than front wings. order ephemeroptera b. front and hind wings nearly equal in size. order odonata the insect pictured is in the order diptera. ephemeroptera. coleoptera. odonata.