Microorganisms Friends and Foe Worksheet-2

Microorganisms Friends and Foe Worksheet-2

1. What causes dough to rise when yeast is added to it?

(a) An increase in temperature

(b) An increase in the amount of substance

(c) An increase in the number of yeast cells

(d) the release of carbon dioxide gas

2. What process takes place when yeast is added to grape juice and left for a week?

(a) Decomposition                       (b) Fermentation

(c) Distillation                               (d) Oxidation

3. Cellulose found in plants can be digested by herbivores because of the presence of certain bacteria which secrete:

(a) amylase       (b) cellulase      (c) lipase            (d) protease

4. Microorganisms are used in biotechnology for:

I – The production of bioplastic

II – The production of hormones

III – Gene therapy

(a) II only                                       (b) II and III only

(c) I and III only                           (d) I, II and III

5. Bacteria are used in the production of:

I – Alcohol

II – Cheese

III – Yoghurt

(a) I only                                         (b) II and III only

(c) I and III only                           (d) I, II and III

6. Hepatitis is caused by:

(a) viruses         (b) bacteria       (c) fungi             (d) protozoa

7. Microorganisms which cause diseases are called:

(a) antigens       (b) antibodies   (c) pathogens    (d) vectors

8. Mosquitoes are vectors for:

I – dengue fever

II – malaria

III – cholera

(a) I only                                         (b) I and II only

(c) II and III only                          (d) I, II and III

9. Which of the following acts as a host for the virus which cause dengue fever?

(a) Mosquitoes                              (b) Houseflies

(c) Rats                                           (d) Humans

10. The information below describes the disease:

It is caused by a protozoan

It causes fever

It can cause anaemia

(a) cholera         (b) malaria        (c) filiriasis        (d) hepatitis

Answer Key:

(1)-(d); (2)-(b); (3)-(b); (4)-(b); (5)-(b); (6)-(a); (7)-(c); (8)-(b); (9)-(a); (10)-(b)