CBSE Class 8 Science Micro Organisms Friends and Foe Assignment Set C

CBSE Class 8 Science - Micro Organisms Friends and Foe (3)

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1.Microorganisms are found in

(A) Air, water and soil. (B) Living and dead soil.

(C) Hot springs and ice-cold water. (D) All of the above.

2.Alexander Fleming is associated with-

(A) Fermentation. (B) Antibiotic Penicillin.

(C) Tetanus disease. (D) Cork cells.

3.Fruit and fruit juices are often get spoiled due to fermentation. Microorganisms responsible

for this are:

(A) Viruses. (B) Protozoans. (C) Yeasts. (D) None of these.

4.Disease causing micro-organisms are:

(A) Bacteria. (B) Viruses. (C) Fungi. (D) All of the above..

5.Micro-organisms are

(A) Harmful. (B) Beneficial. (C) Both (a) and (b). (D) None of these.

6.Lactobacillus bacteria are responsible for the formation of:

(A) cake. (B) curd. (C) bread. (D) pasteries.

7.Who discovered fermentation?

(A) Alexander Fleming. (B) Edward Jenner. (C) Louis Pasteur. (D) Robert Koch.

8.High and low temperature

(A) inhibits the growth of microorganism. (B) kills many microorganism.

(C) increase the growth of organism. (D) Both (a) and (b).

9.Pathogens can enter our body through

(A) the air we breathe. (B) the water we drink.

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