Microorganisms Friends and Foe Worksheet-10

Microorganisms Friends and Foe Worksheet-10

1. Select the correct sequences of microorganisms according to size, starting with the smallest.

(a) Coccus, virus, bacillus, mould, yeast, Spirogyra

(b) Virus, coccus, bacillus, mould, yeast, Spirogyra

(c) Virus, coccus, bacillus, yeast, mould, Spirogyra

(d) Virus, bacillus, coccus, yeast, mould, Spirogyra

2. Beer and wine are both alcoholic drinks which are produced from different sources. Select the correct statement regarding the production of each.

(a) Wine is prepared by fermentation of grapes and beer by decantation of barley

(b) Wine is prepared by fermentation of sugar in grapes and beer by fermentation of sugar fn germinating barley

(c) Wine is prepared by fermentation of sugar in barley and beer by fermentation of sugar in grapes

(d) None of these

3. The microorganisms that cause diseases are known as pathogens or germs. Microorganisms also cause diseases in animals and plants other than human beings. Select the incorrect statement from the following.

(a) Anthrax is caused by bacteria and it affects humans and cattle

(b) Rust of wheat is a fungal disease

(c) Citrus canker is a viral disease that affects citrus fruits

(d) Yellow vein mosaic is a viral disease, spread by insects and it affects vegetables

4. Which of the following groups represents the bacterial disease?

(a) Cholera, tuberculosis, malaria, measles

(b) Small pox, tuberculosis, malaria, typhoid

(c) Cholera, tuberculosis, typhoid, measles

(d) Cholera, anthrax, tuberculosis, typhoid

5. Azotobacter is a

(a) Curd producing bacteria

(b) Nitrogen fixing bacteria

(c) Immunizing bacteria

(d) Bacteria used for making alcohol

6. Our atmosphere has 78% nitrogen gas. Nitrogen is one of the essential constituent of all living organisms as part of proteins, chlorophyll, nucleic acid and vitamins. Select the correct statement related to nitrogen.

(a) Not useful for plants

(b) Important for growth of plants, and is taken by all plants from the air

(c) Important for growth of plants, but only some plants absorb the nitrogen present in the air directly

(d) Important for growth of plants, but no plant can absorb the nitrogen present in the air directly

7. Cholera is a ____ disease whereas common cold is a ____ disease.

(a) Bacterial, viral                        (b) Viral, protozoan

(c) Viral, bacterial                        (d) None of these

8. DPT vaccine is given to an infant to protect against which disease(s)/disorder(s)

(a) Diarrhoea, paralysis, trauma

(b) Diphtheria, pertussis, tetanus

(c) Diphtheria, pertussis, typhoid

(d) None of these

9. The medicines produced by micro-organisms which in low concentration are antagonistic to the growth of other micro-organism are called

(a) Vaccine                                     (b) Antibiotics

(c) Interferon                                (d) None of these

10. Bacteria are single celled organisms that vary in shape and size. Given below are figures of different bacteria. Identify Bacillus.

(a)                       (b)

(c)                                     (d)

Answer Key:

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