Class 8 Science Chapter 2 MCQ (Multiple Choice Questions) of Microorganism: Friend and Foe. There are 25 MCQ Tests containing more than 100 questions with answers and explanation, prepared for new academic session 2021-22.

MCQ are prepared from NCERT Textbook of Class 8 Science and Exemplar book including all the best questions for practice.

Class 8 Science Chapter 2 MCQ for 2021-22

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Chapter 2:MCQ Tests of Microorganism: Friend and Foe

Class 8 Science Chapter 2 MCQ Tests for Exams

Class 8 Science Chapter 2 MCQ Tests of Microorganism: Friend and Foe with complete explanation and answers. All the questions have four option with one option correct. After attempting you can see the answer and explanation for justification. All the important topics of NCERT Books 8th Science Chapter 2 have been added in these MCQs.

Q1

In which of the following statements is or are incorrect?

[A]. Antibodies are specific molecules produced against innovating microbes.
[B]. Tuberculosis is an infectious airborne disease.
[C]. Anthrax are the antimicrobial agents for inhibiting the growth of microbes.
[D]. Yeast are used in the wine industry.
Q2

Which of the following reproduces only inside a host cell?

[A]. Bacteria
[B]. Virus
[C]. Amoeba
[D]. Fungus
Q3

Paheli wants to know the non-benefits about microorganisms?

[A]. They can create production of alcohol by fermentation.
[B]. They can create rust of wheat.
[C]. They are caused in cleaning up of the environment.
[D]. None of the above.
Q4

What do you mean by communicable diseases?

[A]. It can spread from infected person to others.
[B]. It can spread by street food.
[C]. It can be spread by coughing and sneezing.
[D]. All the above.
Q5

A disease in human beings caused by virus is

[A]. Typhoid
[B]. Influenza
[C]. Dysentery
[D]. Cholera




Q6

Paheli wants to pick out the incorrect sentences from the given statements:

[A]. Foot and mouth disease is caused in human by a virus.
[B]. Rust of wheat is a bacterial disease in plants.
[C]. Yellow vein mosaic of bhindi okra is a fungal disease in plants.
[D]. All the above.
Q7

Boojho wants to know the incorrect sentences about viruses?

[A]. Viruses are the smallest micro-organisms.
[B]. Viruses do not respire, feed, excrete or move.
[C]. Viruses can reproduce, in bacteria cells.
[D]. None of the above.
Q8

Pathogenic microorganisms present in host cells are killed by medicines called

[A]. Pain killer
[B]. Antibodies
[C]. Antibiotics
[D]. Vaccines
Q9

Paheli is writing some sentences about “algae”. In which of sentences, she is writing as incorrect?

[A]. Spirogyra is single-celled algae.
[B]. Chlamydomonas and diatoms are multi-celled algae.
[C]. Blue-green algae can not fix nitrogen gas of atmosphere.
[D]. All the above.
Q10

In which of the following statement is or are incorrect?

[A]. Fungi are a large group of organisms which do not have chlorophyll.
[B]. All fungi are made up of fine threads, except penicillium.
[C]. A mould is a fur-like growth of minute fungi, occurring an organic matter in most and warm condition.
[D]. Some of the human diseases caused by fungi are ringworm.



Q11

The two microorganisms which live in symbiotic association in lichens are

[A]. Fungus and protozoa
[B]. Algae and bacteria
[C]. Bacteria and protozoa
[D]. Algae and fungus
Q12

Paheli wants to write some correct statements. Would you help her?

[A]. Can we say yeast is a fungus.
[B]. Yeast can do respiration and reproduction.
[C]. Yeast can increase the volume of dough.
[D]. All the above.
Q13

The precaution is observed in the use of antibiotics. Choose the incorrect sentence(s):

[A]. Antibiotic may kill the useful bacteria in the body and harm us.
[B]. Wrong dose of antibiotics makes the antibiotic less effective.
[C]. Antibiotics should be taken only on the advice of perfect doctor.
[D]. None of the above
Q14

In which of the following human diseases are caused by protozoa?

[A]. Hepatitis B
[B]. Typhoid
[C]. Malaria
[D]. All the above
Q15

Boojho wants to know the preventing method which should not be listed?

[A]. We should make sure that only disposal syringes and needles are used for giving us injection.
[B]. Make sure injections are need to reuse.
[C]. We should avoid to take towels, clothes, bed, utensils used by an infected person.
[D]. All the above




Q16

In which of the following human disease is or are caused by bacteria?

[A]. Typhoid
[B]. Cholera
[C]. Tuberculosis
[D]. All the above
Q17

Robert Koch discovered the bacillus anthracis in 1876 which cause Anthrax (a dangerous human and cattle) disease caused by

[A]. Virus
[B]. Fungi
[C]. Bacteria
[D]. Protozoa
Q18

In which of the following statement is or are incorrect?

[A]. We should avoid eating covered food items.
[B]. The food should always be kept covered.
[C]. We should not leave household garbage here and there.
[D]. Some of disease can be prevented by vaccination.
Q19

Malaria is caused by

[A]. Bacteria
[B]. Virus
[C]. Fungus
[D]. None of the above.
Q20

There are given some statements. Boojho wants to know which of the following statement is or are incorrect?

[A]. Housefly carries the disease-causing microbes’ insides the body.
[B]. Mosquito carries microbes outside its body.
[C]. Ades mosquito carries the plasmodium parasite of malaria.
[D]. All the above



Q21

Poliomyelitis is responsible virus for polio. Who discovered polio vaccine?

[A]. Louis Pasteur
[B]. Jonas Salk
[C]. Robert Koch
[D]. None of the above
Q22

Consider the given statements. Choose, which of the following statement is or are correct?

[A]. Hemocyanin and streptomycin are the antibiotics.
[B]. Antibiotics are not effective against disease caused by virus.
[C]. Antibiotics are not effective to control disease in plants and animals.
[D]. All the above.
Q23

The precaution is observed in the use of antibiotics. Choose the incorrect sentence(s):

[A]. Antibiotic may kill the useful bacteria in the body and harm us.
[B]. Wrong dose of antibiotics makes the antibiotic less effective.
[C]. Antibiotics should be taken only on the advice of perfect doctor.
[D]. None of the above
Q24

A disease “Tetanus” is caused by which bacteria:

[A]. Clostridium tetani
[B]. Vibrio cholerae
[C]. Salmonella typhi
[D]. Mycobacterium tuberculosis
Q25

Paheli and boojho discussed a topic of microorganisms. Choose which of the following statements is or are incorrect?

[A]. A dilute solution of Acetic acid is called vinegar.
[B]. Acetobacter bacteria convert alcohol into acetic acid.
[C]. Yeast is capable of converting sugar into alcohol.
[D]. None of the above.

Types of Fungi

Yeasts:Unicellular organisms.
Moulds:Multi cellular organisms.
Mushrooms:Multi cellular organisms.
Maldews:Unicellular organisms.



The Common Characters of Viruses
    • They are the smallest living organisms.
    • They do not have a cellular structure.
    • They have a simple structure, consisting of a small piece of Nucleic Acid (either DNA or RNA), surrounded by a protein coat.
    • They are on the boundary between living and non-living.
Discovery of Viruses

In 1852, a Russian botanist D.I. Ivanovsky discovered viruses from tobacco plants. These viruses were named as TMV (Tabacco Mosaic Viruses). Viruses are the smallest living organisms, ranging in size from about 20-300 mm on average. They cannot be seen with the simple microscope. They pass through filters which retain bacteria.

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Class 8 Science Chapter 2 Extra Questions

What is micro-biology?

There is a world of living organisms which cannot be seen with the naked eyes. They can be seen only through a microscope. Microorganisms are often described as single -celled or unicellular organisms, but there are certain species that are multi-cellulars. The study of micro-organisms is called micro-biology.

What are Extremophiles?

Micro-organisms are found in a variety of places, and they can survive in extremely harsh environmental
conditions. Some types of micro-organisms have adapted to the extreme conditions and sustained colonies; these organisms are known as Extremophiles.

What is Bacteriology?

Becteria are microscopic, unicellualar organisms. They are often coocus -(Spherical) or red-shaped and 0.5- 51/m in the longest dimension. The study of bacteria is known as Bacteriology.

What are Pathogens?

Some micro-organisms are useful to us in many ways, while some are definitely harmful since they cause diseases. The microorganisms which cause disease are known as Pathogens.