Here we are providing Class 8 Science Objective Chapter – 2 Microorganisms: Friend and Foe because its very important for Class 8 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 8 Science Objective Chapter – 2 Microorganisms: Friend and Foe is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 8 Science Objective Chapter – 2 Microorganisms: Friend and Foe Wastewater Story 100+ questions so that students practice more and more. If you want class wise Notes Then Click Here
Class 8 Science Objective Chapter – 2 Microorganisms: Friend and Foe
1.Tiny organisms which cannot be seen with the naked eyes are called
( A ) microorganisms
( B ) animals
( C ) fungi
( D ) bacteria
Ans – ( A )
2.The host for malaria causing protozoan is:
( A ) anapheles mosquito
( B ) the cow
( C ) the earthworm
( D ) the tapeworm
Ans – ( A )
3.Microorganisms are also known as
( A ) yeast
( B ) microbes
( C ) viruses
( D ) Amoeba
Ans – ( B )
4.The bread or dosa dough rises because of the action of:
( A ) heat
( B ) grinding
( C ) growth of yeast cells
( D ) none of these
Ans – ( C )
5.Fungus can be seen with a
( A ) microscope
( B ) telescope
( C ) magnifying glass
( D ) both ( A ) and (c)
Ans – ( D )
6.Malaria is spread by:
( A ) plasmodium
( B ) female anapheles mosquito
( C ) male anapheles mosquito
( D ) none of these
Ans – ( B )
7.Microorganisms that causes disease are also known as
( A ) pathogens
( B ) fungi
( C ) antigen
( D ) microbes
Ans – ( A )
8.Protozoan shaped like a slipper is:
( A ) amoeba
( B ) paramecium
( C ) euglena
( D ) entamoeba
Ans – ( B )
9.Pathogens are also called
( A ) germs
( B ) antigen
( C ) antibody
( D ) carrier
Ans – ( A )
10.The bacterium that turns milk into curd is:
( A ) lactobacillus
( B ) acetobacter
( C ) rhizobium
( D ) none of these
Ans – ( A )
11.Bacteria are ______ organisms.
( A ) multicellular
( B ) unicellular
( C ) bicellular
( D ) tricellular
Ans – ( B )
12.The bacteria was first observed by:
( A ) Louis Pasteur
( B ) Antony Von Leuwen Hook
( C ) Robert Hooke
( D ) Robert Koch
Ans – ( B )
13.Bacilli are the bacteria that are
( A ) rod-shaped
( B ) comma-shaped
( C ) curved-shaped
( D ) spiral
Ans – ( A )
14.Virus reproduce:
( A ) only outside the cells of the host organisms
( B ) only inside the cells of the host organisms
( C ) both inside and outside the cells of the host organisms
( D ) none of these
Ans – ( B )
15.Spherical-shaped bacteria are called
( A ) bacilli
( B ) vibrio
( C ) spirilla
( D ) cocci
Ans – ( D )
16.Simple, plant-like microorganisms are called
( A ) algae
( B ) bacteria
( C ) both ( A ) and (b)
( D ) protozoa
Ans – ( A )
17.Medium that transmits pathogens from an infected person to a healthy one is called
( A ) fungi
( B ) germs
( C ) carrier
( D ) none of these
Ans – ( C )
18.Which of the following lives alone:
( A ) amoeba
( B ) fungi
( C ) bacteria
( D ) all of these
Ans – ( A )
19.Medicine that kills or stops the growth of harmful disease-causing microbes is known as
( A ) antibiotic
( B ) antibody
( C ) antigen
( D ) vaccine
Ans – ( A )
20.The process of conversion of sugar into alcohol is known as:
( A ) pasteurisation
( B ) fermentation
( C ) decomposition
( D ) none of these
Ans – ( B )
21.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
Ans – ( C )
22.In Pasteurisation the milk is heated to about:
( A ) 100°C
( B ) 50°C
( C ) 70°C
( D ) 110°C
Ans – ( C )
23.The fungus that is commonly used in bakery and beverage industries is
( A ) Penicillium
( B ) Yeast
( C ) Agaricus
( D ) Rhizopus
Ans – ( B )
24.The bacterium living in the root nodules of leguminous plants is:
( A ) lactobacillus
( B ) acetobactor
( C ) rhizobium
( D ) none of these
Ans – ( C )
25.Giardia is listed under the category of
( A ) fungi
( B ) protozoa
( C ) bacteria
( D ) algae
Ans – ( B )
26.Atmospheric nitrogen ¡s used for the synthesis of:
( A ) plant proteins
( B ) animal proteins
( C ) plant carbohydrates
( D ) none of these
Ans – ( A )
27.Substance used to produce immunity against diseases in the living body is called
( A ) immune
( B ) vaccine
( C ) antibody
( D ) antigen
Ans – ( B )
28.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
Ans – ( C )
29.How much nitrogen is present in the atmosphere?
( A ) 78%
( B ) 88%
( C ) 68%
( D ) 58%
Ans – ( A )
30.Alcohol is produced with the help of
( A ) sodium chloride
( B ) yeast
( C ) nitrogen
( D ) carbon dioxide
Ans – ( B )
31.Malaria is caused by which type of microbe?
( A ) Bacteria
( B ) Fungi
( C ) Algae
( D ) Protozoa
Ans – ( D )
32.Which of the following drug is an antipyretic?
( A ) Insulin
( B ) Alcohol
( C ) Streptomycin
( D ) Paracetamol
Ans – ( D )
33.Common cold is caused by which type of microbe?
( A ) Bacteria
( B ) Virus
( C ) Algae
( D ) Fungi
Ans – ( B )
34.What helps in the rise of bread or dosa dough?
( A ) Heat
( B ) Grinding
( C ) Growth of yeast cells
( D ) Low pressure
Ans – ( C )
35.Which of the following diseases is caused by a fungus?
( A ) Cholera
( B ) Common cold
( C ) Ringworm
( D ) Dengue
Ans – ( C )
36.The status of algae in the aquatic food chain is
( A ) consumers
( B ) producers
( C ) host
( D ) small in size
Ans – ( B )
37.Antibiotics are effective against
( A ) bacteria
( B ) algae
( C ) viruses
( D ) all of the above
Ans – ( A )
38.The rod shaped bacteria are called
( A ) Bacillus
( B ) Coccus
( C ) Vibrio
( D ) Spirillum
Ans – ( A )
39.Penicillin was discovered by
( A ) Edward Jenner
( B ) Louis Pasteur
( C ) Alexander Fleming
( D ) Robert Koch
Ans – ( C )
40.Bacteria present in root nodules of pea
( A ) Coli
( B ) Plasmodium
( C ) Rhizobium
( D ) Penicillin
Ans – ( C )
41.Mushroom belongs to the group of
( A ) algae
( B ) viruses
( C ) fungi
( D ) none of these
Ans – ( C )
42.The disease caused by protozoa is
( A ) tuberculosis
( B ) polio
( C ) typhoid
( D ) malaria
Ans – ( D )
43.Amoeba belongs to
( A ) algae
( B ) fungi
( C ) protozoa
( D ) viruses
Ans – ( C )
44.Which cannot fix atmospheric nitrogen in the soil?
( A ) Rhizobium
( B ) Clostridium
( C ) Azotobacter
( D ) Penicillin
Ans – ( D )
45.Scientist who discovered fermentation is
( A ) Alexander Fleming
( B ) Louis Pasteur
( C ) John Mendel
( D ) Edward Jenner
Ans – ( B )
46.Which microorganism causes AIDS?
( A ) A protozoa
( B ) A bacteria
( C ) A virus
( D ) An algae
Ans – ( C )
47.Microorganisms are
( A ) unicellular
( B ) multicellular
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( C )
48.Which of the following disease is spread due to bacteria?
( A ) Tuberculosis
( B ) Measles
( C ) Chicken pox
( D ) Polio
Ans – ( A )
49.The microorganisms that cause diseases in human beings, plants and animals are called
( A ) carriers
( B ) mosquitoes
( C ) pathogens
( D ) antibodies
Ans – ( C )
50.Which of the following is not used as food preservatives?
( A ) Salt
( B ) Sugar
( C ) Vinegar
( D ) Methane
Ans – ( D )
51.Who discovered the vaccine for smallpox?
( A ) Louis Pasteur
( B ) Alexander Fleming
( C ) Joseph Lister
( D ) Edward Jenner
Ans – ( D )
52.The process by which amount of nitrogen remains the same in the atmosphere is known as
( A ) fermentation
( B ) carbon cycle
( C ) nitrogen cycle
( D ) photosynthesis
Ans – ( C )
53.The algae commonly used as a fertiliser are
( A ) staphylococcus
( B ) diatoms
( C ) blue-green algae
( D ) none of these
Ans – ( C )
54. The microorganism which contains chlorophyll
( A ) Virus
( B ) Fungus
( C ) Algae
( D ) All
Ans – ( C )
55.The microorganisms smaller than bacteria are
( A ) viruses
( B ) protozoan
( C ) fungi
( D ) algae
Ans – ( A )
