Class 8 Science Chapter 2 MCQ

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 2020-21.

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 2020-21

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.


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

A disease in human beings caused by virus is

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


Pathogenic microorganisms present in host cells are killed by medicines called

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

A disease “Tetanus” is caused by which bacteria:

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

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

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

[A]. Measles
[B]. Polio
[C]. Chicken Pox
[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

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.


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

A disease “Tetanus” is caused by which bacteria:

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

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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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.