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Question-1 The spoilage of milk is prevented by ...........i........... Vegetables are treated by ............ii.......... to preserve them from attack of microbes.
The information in which row completes the given statement.

(A) i -Sugar; ii - salt	(B)i - Pasteurization; ii - salt
(C)i - Pasteurization; ii - oil and vinegar	(D)i - Sugar; ii - oil and vinegar

Question-2 ...........i........... and ...........ii.......... are used for the production of antibiotics. The information in which row completes the given statement?

(A) i - Bacteria; ii - fungi	(B)i - Fungi; ii- protozoan
(C)i- Protozoan; ii- algae	(D)i- Algae; ii- bacteria

Question-3 Which of the following actions is a preventive measure for controlling occurrence of malaria ?

(A) Consumption of properly cooked food.	(B)Taking periodic vaccination.
(C)Isolating patients and their belongings.	(D)Avoiding accumulation of water in and around neighborhood.

Question-4 Which of the following micro organisms convert nitrogenous waste into nitrogen compound ?

(A) Bacteria and fungi	(B)Fungi and protozoan
(C)Protozoan and algae	(D)Algae and bacteria

Question-5 Which of the following diseases can be transmitted by air?

(A) Measles	(B)Cholera
(C)Typhoid	(D)Malaria

Question-6 Yellow vein mosaic of bhindi is a plant disease that occurs because of ...........i........... infection while citrus canker occurs because of ...............ii.............. infection.
The information in which row completes the given statement?

(A) i - Viral; ii - bacterial	(B)i - Bacterial; ii- viral
(C)i- Protozoan; ii - fungal	(D)i -Fungal; ii - protozoan

Question-7 Use the following information to answer next question.
Shyam performed an activity in which he took a small amount of yeast. He kneads yeast powder along with flour to form dough. He then kept the dough for 2 hrs, and observed that volume of dough increased.

(A) Carbon dioxide	(B)Acetic acid
(C)Alcohol	(D)Oxygen

Question-8 Microbial diseases that can spread from an infected person to a healthy person are known as ........i........... diseases. The examples of such diseases are .........ii........... and .............iii............. The information in which row completes the given statements ?

(A) i- Communicable; ii- cholera; iii - typhoid	(B)i- Non-communicable ; ii- cholera ; iii- cancer.
(C)i- Communicable ; ii- cancer ; iii- diabetes	(D)i- non-communicable ; ii- diabetes ; iii- typhoid

Question-9 Common salt is used for preservation of ........i......... and ..........ii......... for long time. The information in which row completes the given statement ?

(A) i -Meat; ii - Jams	(B)i - Jams; ii - jellies
(C)i - Jellies; ii - Fish	(D)i - Fish; ii - meat

Question-10 Foot and mouth disease of cattle is caused by

(A) Bacterium	(B)Virus
(C)Fungi	(D)Protozoan

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Std 8

CBSE

Practice in Related Chapters
Reproduction in Animals
Microorganisms: Friend and Foe
Reaching the Age of Adolescence
Cell - Structure and Functions
Conservation of Plants and Animals
Crop Production & Management

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