Microorganisms Friends and Foe Worksheet-1

Microorganisms Friends and Foe Worksheet-1

1. Which of the following is the smallest microorganism?

(a) Alga              (b) Bacterium   (c) Protozoan    (d) Virus

2. The figures given below shows microorganisms W, X and Y. Identify them.

(a) W-Virus, X-Protozoan, Y-Fungus

(b) W-Alga, X-Bacterium, Y-Virus

(c) W-Virus, X-Fungus, Y-Protozoan

(d) W-Fungus, X-Alga, Y-Bacterium

3. Bacteria are classified according to their

I – nutrition

II – respiration

III – reproduction

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

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

4. Which of the following statements describe bacteriophage correctly?

(a) It is a bacterium which causes diseases in plants

(b) It is a type of virus which attacks bacteria

(c) It is a bacterium which kills viruses

(d) It can multiply inside both living and non-living cells

5. At 37°C and in damp conditions, bacteria reproduce easily through:

(a) budding                                    (b) binary fission

(c) conjugation                              (d) spore formation

6. The figure given below shows the method of reproduction of a microorganism.

Which of the following combination is correct?

(a) Microorganisms: Viruses

      Method of reproduction: Binary fission

(b) Microorganisms: Fungi

      Method of reproduction: Budding

(c) Microorganisms: Algae

      Method of reproduction: Conjugation

(d) Microorganisms: Fungi

      Method of reproduction: Spore formation

7. Which of the following characteristics is true of a virus?

I – It has a nucleus

II – It reproduces only in living cells

III – It contains either DNA or RNA

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

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

8. Algae are autotrophs because they:

(a) carry out anaerobic respiration

(b) can manufacture their own food

(c) feed on dead organisms

(d) feed on other living organisms

9. When fungal spores land on a piece of bread left on a table after a few days, the bread becomes mouldy. What conditions favour the growth of the fungus?

I – The presence of food

II – The moist temperature

III – The absence of water

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

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

10. Which of the following microorganisms play important roles in maintaining the balance of nitrogen gas in the atmosphere?

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

Answer Key:

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