Question 26.
Cholera is due to:
(a) virus
(b) fungus
(c) protozoan
(d) bacterium

Answer

Answer: (d) bacterium

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Question 27.
Yeast helps in the production of:
(a) sugar
(b) alcohol
(c) oxygen
(d) none of these

Answer

Answer: (b) alcohol

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Question 28.
Substance used to produce immunity against diseases in the living body is called
(a) immune
(b) vaccine
(c) antibody
(d) antigen

Answer

Answer: (b) vaccine

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Question 29.
Common cold is caused by which type of microbe?
(a) Bacteria
(b) Virus
(c) Algae
(d) Fungi

Answer

Answer: (b) Virus

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Question 30.
Malaria is spread by:
(a) plasmodium
(b) female anapheles mosquito
(c) male anapheles mosquito
(d) none of these

Answer

Answer: (b) female anapheles mosquito

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Question 31.
The algae commonly used as fertilisers are called:
(a) chlorellin
(b) blue-green algae
(c) spirogyra
(d) none of these

Answer

Answer: (b) blue-green algae

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Question 32.
The bacterium that turns milk into curd is:
(a) lactobacillus
(b) acetobacter
(c) rhizobium
(d) none of these

Answer

Answer: (a) lactobacillus

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Question 33.
Protozoan shaped like a slipper is:
(a) amoeba
(b) paramecium
(c) euglena
(d) entamoeba

Answer

Answer: (b) paramecium

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Question 34.
Which of the following lives alone:
(a) amoeba
(b) fungi
(c) bacteria
(d) all of these

Answer

Answer: (a) amoeba

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Question 35.
Mushroom belongs to the group of
(a) algae
(b) viruses
(c) fungi
(d) none of these

Answer

Answer: (c) fungi

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Question 36.
The percentage of nitogen in the atmosphere:
(a) increases during day time
(b) decreases during day time
(c) remains more or less constant
(d) can’t say

Answer

Answer: (c) remains more or less constant

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Question 37.
Hepatitis-A is transmitted through:
(a) water
(b) air
(c) food
(d) contact

Answer

Answer: (a) water

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Question 38.
Leprosy is caused by:
(a) bacteria
(c) virus
(b) protozoa
(d) fungi

Answer

Answer: (a) bacteria

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Question 39.
What helps in the rise of bread or dosa dough?
(a) Heat
(b) Grinding
(c) Growth of yeast cells
(d) Low pressure

Answer

Answer: (c) Growth of yeast cells

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Question 40.
Malaria is caused by which type of microbe?
(a) Bacteria
(b) Fungi
(c) Algae
(d) Protozoa

Answer

Answer: (d) Protozoa

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Question 41.
The disease caused by fungi is
(a) measles
(b) chicken pox
(c) polio
(d) ringworm

Answer

Answer: (d) ringworm

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Question 42.
A group of micro organisms that have the characters of both living and non-living are:
(a) bacteria
(b) protozoa
(c) virus
(d) fungi

Answer

Answer: (c) virus

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Question 43.
The process in which sugar in the food is transformed into alcohol and carbon dioxide by using microorganisms is known as
(a) transformation
(b) beverage
(c) fermentation
(d) respiration

Answer

Answer: (c) fermentation

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Question 44.
BCG vaccine is used to curb:
(a) cholera
(b) tuberculosis
(c) polio
(d) typhoid

Answer

Answer: (b) tuberculosis

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Question 45.
The disease caused by protozoa is
(a) tuberculosis
(b) polio
(c) typhoid
(d) malaria

Answer

Answer: (d) malaria

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Question 46.
The process of conversion of sugar into alcohol is known as:
(a) pasteurisation
(b) fermentation
(c) decomposition
(d) none of these

Answer

Answer: (b) fermentation

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Question 47.
is the process by which alcohol and Co₂ are produced by yeast cells.
(a) respiration
(b) digestion
(c) evaporation
(d) fermentation

Answer

Answer: (a) respiration

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Question 48.
The rod shaped bacteria are called
(a) Bacillus
(b) Coccus
(c) Vibrio
(d) Spirillum

Answer

Answer: (a) Bacillus

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Question 49.
The microorganisms smaller than bacteria are
(a) viruses
(b) protozoan
(c) fungi
(d) algae

Answer

Answer: (a) viruses

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Question 50.
Cause of malaria is:
(a) fungi
(b) bacteria
(c) protozoa
(d) virus

Answer

Answer: (c) protozoa

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