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Question-1 Yeast is used for commercial production of alcohol and .........i......... by ......ii........ respiration. Which information completes the given statement ?

(A) i -Wine; ii - aerobic	(B)i- Antibiotics; ii - anaerobic
(C)i -Wine; ii - anaerobic	(D)i- Antibiotics; ii- aerobic

Question-2 Vaccines are not available against which of the following diseases ?

(A) Small pox	(B)Hepatitis B
(C)Measles	(D)Malaria

Question-3 Blue green algae increases the fertility of soil. Which plant nutrient is added to soil by blue green algae ?

(A) Potassium	(B)Nitrogen
(C)Phosphorous	(D)Calcium

Question-4 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-5 Carrier of dengue virus is

(A) Female Aedes mosquito	(B)Male Aedes mosquito
(C)Female Anopheles mosquito	(D)Male Anopheles mosquito

Question-6 Which of the following diseases can be transmitted by air?

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

Question-7 The .........i........... Anopheles mosquito transmits ...........i........... through its bite. Which information completes the given statement ?

(A) i- Female; ii- Trypanosoma	(B)i- Male; ii - Plasmodium
(C)i- Male; ii - Trypanosoma	(D)I -Female; ii - Plasmodium

Question-8 Which of the following diseases is caused by virus ?

(A) Tuberculosis and polio	(B)Polio and malaria
(C)Chicken pox and measles	(D)Cholera and typhoid.

Question-9 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-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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