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 2023-24. 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

Class: 8Science
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.


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.

Consider the following sentences and choose the correct statements.

[A]. Edward Jenner is known for his role in identification of the causing agent of Anthrax.
[B]. Robert Koch discovered the vaccine for smallpox in 1798.
[C]. Louis Pasteur discovered fermentation in 1857 by demonstrating the microbes cause souring of milk.
[D]. All the above

Which of the following reproduces only inside a host cell?

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

Paheli wants to know the incorrect statements, given by her teacher as home-work?

[A]. Sodium chloride prevents microbial infection in food.
[B]. Rhizobium may be called beneficial bacteria.
[C]. Vector are the agents for killing the microbes.
[D]. None of the above

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.

Boojho wants to know the incorrect sentences about bacteria?

[A]. Bacteria found in air soil and water.
[B]. Bacteria are found inside our bodies.
[C]. Bacteria are larger than viruses.
[D]. Bacteria cannot feed and respire.

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.

Consider the following statement and choose the incorrect sentences.

[A]. Protozoa are a group singled-celled microorganism.
[B]. Amoeba is an example of protozoa.
[C]. Entamoeba is a protozoan which causes a disease known as malaria in humans.
[D]. Can we say that protozoan is classified as animals.

A disease “Tetanus” is caused by which bacteria:

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

In which of the following statement is or are incorrect?

[A]. Milk is turned into curd by fungi.
[B]. Milk contain a sugar lactose and fructose.
[C]. Lactobacilli fungi convert the lactose sugar into lactic acid.
[D]. None of the above.

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.

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

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

[A]. Measles
[B]. Polio
[C]. Chicken Pox
[D]. All the above

Choose the way which are not responsible for the spread of communicable disease

[A]. Common cold disease spread by taking ice cream, cold drinks and playing in the sun.
[B]. Cholera spreads by taking insects bites.
[C]. AIDS spread by sharing towel clothes bed used by infected person.
[D]. None of the above.

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

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

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

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

Paheli wants to know the method for preventing the occurrence or spread of communicable diseases:

[A]. We should keep our food covered.
[B]. We should also keep a safe distance from a person having common cold and coughing.
[C]. We should protect ourselves from mosquito bites.
[D]. All the above.

The disease caused by a protozoan and spread by an insect is

[A]. Dengue
[B]. Malaria
[C]. Polio
[D]. Measles

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.

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

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

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

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.

Asthma is a chronic inflammatory disease in lungs. Name the fungus, who is responsible for this?

[A]. Pasteurella pestis
[B]. Aspergillus fumigatus.
[C]. Salmonella typhi
[D]. Clostridium tetani

A disease “Tetanus” is caused by which bacteria:

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

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.

Last Edited: June 12, 2023