Microorganisms Friends and Foe Worksheet-6

Microorganisms Friends and Foe Worksheet-6

1. Gastroenteritis, the inflammation of stomach and intestine, is caused by:

(a) E.coli                                        (b) Amoeba

(c) Bacillus bacteria                    (d) Salmonella typhi

2. The figures given below shows four types of microorganisms P, Q, R and S. What microorganisms are repre­sented by P, Q, R and S respectively?

(a) P-Bacteria, Q-Protozoa, R-Viruses, S-Algae

(b) P-Protozoa, Q-Viruses, R-Algae, S-Bacteria

(c) P-Viruses, Q-Algae, R-Protozoa, S-Bacteria

(d) P-Algae, Q-Protozoa, R-Bacteria, S-Viruses

3. Which characteristic cannot be used to differentiate bacteria?

(a) Shape           (b) Nutrition     (c) Size              (d) Habitat

4. Which industry involves the use of microorganisms?

(a) The production of chemical fertil­izers

(b) The production of fireworks

(c) The production of soft drinks

(d) The production of antibiotics

5. A microorganism ‘X’ is used in the mak­ing of bread. In which of these produc­tions is ‘X’ also required?

(a) Cheese         (b) Vinegar        (c) Wine             (d) Yoghurt

6. The figure given below shows the root nodules of legumes such as long beans or groundnuts.

What is the importance of the presence of bacteria in the root nodules of le­gumes?

(a) The nitrate salts produced are used by the plants to produce proteins

(b) The ammonium compounds make the soil more fertile

(c) The nitrate salts produced help the plants to grow faster

(d) The nitrogen produced is required by the plants to accelerate the pro­cess of photosynthesis

7. Which methods are used in the sea­food industry to prevent the growth of decomposer bacteria so that the prod­ucts can be preserved?

I – Drying

II – Using common salt

III – Freezing

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

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

8. What is caused by the harmful effects of certain microorganisms?

(a) Fermentation of glucose      (b) Food poisoning in humans

(c) Heart diseases in humans    (d) Production of antibiotics

9. Infectious diseases caused by microor­ganisms can be spread through:

I – body contact

II – the air

III – a vector

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

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

10. How does a pathogen cause diseases?

I – By producing toxic substances that will destroy the cells or tissues of the host.

II – By destroying red blood cells of the host

III – By releasing a lot of heat to raise the body temperature of the host

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

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

Answer Key:

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