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

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.

(C) the food we eat. (D) All of the above.

10.The medicines which are made with the help of micro-organisms mainly fungi and bacteria and used to kill or stop the growth of the disease-causing micro-organisms are called as:

(A) Vaccines. (B) Antibiotics. (C) Antipyretic drugs. (D) None of the above.

11.Female Aedes mosquito acts as carrier of:

(A) dengue virus. (B) malaria parasite. (C) chicken pox virus. (D) polio virus.

12.The organism which are responsible for the conversion of sugar into alcohol is

(A) Viruses. (B) Bacteria. (C) Yeast. (D) Protozoa.

13. Penicillin, streptomycin, tetracycline are the examples of

(A) Vaccines (B) Antibiotics (C) Antipyretic drugs (D) None of the above

14.Micro-organism can cause food poisoning through:

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

(C) the food we eat. (D) All of the above.

15.Microorganisms are

(A) too small (B) too big

(C) can be visible through naked eyes (D) All of the above

16.The chemicals generally used to check the growth of microorganisms are called as:

(A) pasteurizers. (B) preservatives. (C) cleaners. (D) fertilizers.

17.How much percentage of nitrogen gas are present in our atmosphere?

(A) 84%. (B) 91%. (C) 68%. (D) 78%.

18.The programme in which pulse drops are given to the children is named as:

(A) Save Polio Programme. (B) Help Polio Programme.

(C) Pulse Polio Programme. (D) Check Polio Programme.

Click on link below to download CBSE Class 8 Science Micro Organisms Friends and Foe Assignment Set C