Microorganisms Friends and Foe

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

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

Microorganisms Friends and Foe Worksheet-3

1. Among the diseases given below, which is true about the microorganisms which cause them and the symptoms of the diseases?       

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

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

2. Ringworm can be prevented by:

(a) vaccination

(b) vector control