Microorganisms Friends and Foe Worksheet-8

Microorganisms Friends and Foe Worksheet-8

1. Identify the organism that can photosynthesize but lack the cell wall.

(a)                                      (b)

(c)                               (d)

2. Bacteria are used in experiments to study the effects of changing tempera­ture on the growth of microbes instead of viruses because:

(a) viruses cannot reproduce outside a host

(b) bacteria reproduce faster than vi­ruses

(c) viruses do not have cell walls

(d) bacteria are larger than viruses

3. What microorganisms are used in mak­ing antibiotics?

I – Viruses

II – Fungi

III – Bacteria

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

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

4. What microorganisms are represented by P, Q, R and S?

(a) P-Coccus, Q-Bacillus, R-Vibrio, S-Spirillum

(b) P-Bacillus, Q-Coccus, R-Spirillum, S-Vibrio

(c) P-Bacillus, Q-Vibrio, R-Coccus, S-Spirillum

(d) P-Bacillus, Q-Spirillum, R-Vibrio, S-Coccus

5. Which pair is correct?

(a) Pathogens: Viruses

      Diseases caused: Hepatitis

(b) Pathogens: Bacteria

      Diseases caused: Dengue fever

(c) Pathogens: Fungi

      Diseases caused: Malaria

(d) Pathogens: Protozoa

      Diseases caused: Syphilis

6.  Which of the following exhibit the char­acteristics given below?

X – Form(s) a green scum over wet soil

Y – Closer to bacteria

Z – Pigments mask the chlorophyll

(a) Lichens                                     (b) Volvox

(c) Blue green algae                     (d) Spirogyra

7. Gelatin-like substance used as a solidifying agent in the preparation of medicines and some food products such as puddings and jellies is produced from

(a) Agar-agar                                (b) Pseudomonas

(c) Lactobacillus                           (d) Sargassum

8. Which is the class of organism, living in the body of termites that digests wood cellulose converting it to soluble carbohydrates?

(a) Algae            (b) Bacteria       (c) Protozoa      (d) Nematode

9. The microorganism in the given figure is

(a) Phase in the life cycle of bacteria

(b) Bacteria that eat other bacteria

(c) Virus that uses bacteria as a host

(d) None of these

10. What term is given to small quantity of microbes or their parts live or dead, which when injected into the body confer immunity against a number of diseases causing pathogens?

(a) Antibiotic    (b) Vaccine        (c) Serum          (d) None of these

Answer Key:

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