We have compiled the NCERT MCQ Questions for Class 8 Science Chapter 2 Microorganisms: Friend and Foe with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Science with Answers on a daily basis and score well in exams. Refer to the Microorganisms: Friend and Foe Class 8 MCQs Questions with Answers here along with a detailed explanation.
Microorganisms: Friend and Foe Class 8 MCQs Questions with Answers
Choose the correct option.
Question 1.
Tiny organisms which cannot be seen with the naked eyes are called
(a) microorganisms
(b) animals
(c) fungi
(d) bacteria
Answer
Answer: (a) microorganisms
Question 2.
Microorganisms are also known as
(a) yeast
(b) microbes
(c) viruses
(d) Amoeba
Answer
Answer: (b) microbes
Question 3.
Fungus can be seen with a
(a) microscope
(b) telescope
(c) magnifying glass
(d) both (a) and (c)
Answer
Answer: (d) both (a) and (c)
Question 4.
Microorganisms that causes disease are also known as
(a) pathogens
(b) fungi
(c) antigen
(d) microbes
Answer
Answer: (a) pathogens
Question 5.
Pathogens are also called
(a) germs
(b) antigen
(c) antibody
(d) carrier
Answer
Answer: (a) germs
Question 6.
Bacteria are ______ organisms.
(a) multicellular
(b) unicellular
(c) bicellular
(d) tricellular
Answer
Answer: (b) unicellular
Question 7.
Bacilli are the bacteria that are
(a) rod-shaped
(b) comma-shaped
(c) curved-shaped
(d) spiral
Answer
Answer: (a) rod-shaped
Question 8.
Spherical-shaped bacteria are called
(a) bacilli
(b) vibrio
(c) spirilla
(d) cocci
Answer
Answer: (d) cocci
Question 9.
Simple, plant-like microorganisms are called
(a) algae
(b) bacteria
(c) both (a) and (b)
(d) protozoa
Answer
Answer: (a) algae
Question 10.
Medium that transmits pathogens from an infected person to a healthy one is called
(a) fungi
(b) germs
(c) carrier
(d) none of these
Answer
Answer: (c) carrier
Question 11.
Medicine that kills or stops the growth of harmful disease-causing microbes is known as
(a) antibiotic
(b) antibody
(c) antigen
(d) vaccine
Answer
Answer: (a) antibiotic
Question 12.
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
Question 13.
The fungus that is commonly used in bakery and beverage industries is
(a) Penicillium
(b) Yeast
(c) Agaricus
(d) Rhizopus
Answer
Answer: (b) Yeast
Question 14.
Giardia is listed under the category of
(a) fungi
(b) protozoa
(c) bacteria
(d) algae
Answer
Answer: (b) protozoa
Question 15.
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
Question 16.
How much nitrogen is present in the atmosphere?
(a) 78%
(b) 88%
(c) 68%
(d) 58%
Answer
Answer: (a) 78%
Question 17.
Malaria is caused by which type of microbe?
(a) Bacteria
(b) Fungi
(c) Algae
(d) Protozoa
Answer
Answer: (d) Protozoa
Question 18.
Common cold is caused by which type of microbe?
(a) Bacteria
(b) Virus
(c) Algae
(d) Fungi
Answer
Answer: (b) Virus
Question 19.
Which of the following diseases is caused by a fungus?
(a) Cholera
(b) Common cold
(c) Ringworm
(d) Dengue
Answer
Answer: (c) Ringworm
Question 20.
Antibiotics are effective against
(a) bacteria
(b) algae
(c) viruses
(d) all of the above
Answer
Answer: (a) bacteria
Question 21.
Penicillin was discovered by
(a) Edward Jenner
(b) Louis Pasteur
(c) Alexander Fleming
(d) Robert Koch
Answer
Answer: (c) Alexander Fleming
Question 22.
Mushroom belongs to the group of
(a) algae
(b) viruses
(c) fungi
(d) none of these
Answer
Answer: (c) fungi
Question 23.
Amoeba belongs to
(a) algae
(b) fungi
(c) protozoa
(d) viruses
Answer
Answer: (c) protozoa
Question 24.
Scientist who discovered fermentation is
(a) Alexander Fleming
(b) Louis Pasteur
(c) John Mendel
(d) Edward Jenner
Answer
Answer: (b) Louis Pasteur
Question 25.
Microorganisms are
(a) unicellular
(b) multicellular
(c) both (a) and (b)
(d) none of these
Answer
Answer: (c) both (a) and (b)
Question 26.
The microorganisms that cause diseases in human beings, plants and animals are called
(a) carriers
(b) mosquitoes
(c) pathogens
(d) antibodies
Answer
Answer: (c) pathogens
Question 27.
Who discovered the vaccine for smallpox?
(a) Louis Pasteur
(b) Alexander Fleming
(c) Joseph Lister
(d) Edward Jenner
Answer
Answer: (d) Edward Jenner
Question 28.
The algae commonly used as a fertiliser are
(a) staphylococcus
(b) diatoms
(c) blue-green algae
(d) none of these
Answer
Answer: (c) blue-green algae
Question 29.
The microorganisms smaller than bacteria are
(a) viruses
(b) protozoan
(c) fungi
(d) algae
Answer
Answer: (a) viruses
Fill in the blanks with suitable word/s.
Question 1.
Bacteria, fungi, protozoa and _______ are the major four groups in which microorganisms are classified.
Answer
Answer: algae
Question 2.
Two microorganisms which live in symbiotic association in lichens are _______ and _______
Answer
Answer: algae, fungus
Question 3.
We use a _______ to see the microorganisms.
Answer
Answer: microscope
Question 4.
_______ are considered different from other microorganisms because they can multiply only by entering, the host organisms.
Answer
Answer: Viruses
Question 5.
The gas released during the preparation of bread is _______
Answer
Answer: carbon dioxide
Question 6.
The disease caused by a protozoan and spread by an insect is _______
Answer
Answer: malaria
Question 7.
_______ are curved-shaped bacteria.
Answer
Answer: Vibrio
Question 8.
Saprophytes and _______ are the two main categories of fungi.
Answer
Answer: parasites
Question 9.
_______ are the threads of the multicellular fungi.
Answer
Answer: Hyphae
Question 10.
Yeast is a _______ fungus.
Answer
Answer: unicellular
Question 11.
Protozoa are _______ in nature.
Answer
Answer: heterotrophic
Question 12.
Flu, cough and cold are caused by _______
Answer
Answer: viruses
Question 13.
The first antibiotic discovered was _______
Answer
Answer: penicillin
Question 14.
_______ are the microorganisms that help in the process of decomposition.
Answer
Answer: Decomposers
Question 15.
The process of formation of curd from milk is known as the _______ of milk.
Answer
Answer: curdling
Question 16.
All microorganisms are ………………….. harmful.
Answer
Answer: not
Question 17.
Rhizobium is found in the root nodules of ………………….. plants.
Answer
Answer: leguminous
Question 18.
Alcohol is produced with the help of …………………..
Answer
Answer: yeast
Question 19.
………………….. is a single-celled microorganism.
Answer
Answer: Amoeba
Question 20.
The food material which is preserved by pasteurisation is …………………..
Answer
Answer: milk
Question 21.
Disease-causing microorganisms are called …………………..
Answer
Answer: pathogens
Question 22.
An edible fungus is …………………..
Answer
Answer: mushroom
Question 23.
The antibiotic, first discovered by Alexander Fleming is called …………………..
Answer
Answer: penicillin
Question 24.
As a result of nitrogen cycle, the percentage of nitrogen in the atmosphere remains more or less …………………..
Answer
Answer: constant
Question 25.
………………….. is used in the preparation of bakery products.
Answer
Answer: Yeast
True or False
Question 1.
Microbiology is the science of study of microbes.
Answer
Answer: True
Question 2.
All the microorganisms are harmful.
Answer
Answer: False
Question 3.
An instrument called microscope is required to see the microorganisms.
Answer
Answer: True
Question 4.
Bacteria have an organised nucleus.
Answer
Answer: False
Question 5.
Microorganisms are found in large number around us.
Answer
Answer: True
Question 6.
Viruses are the most useful microbes.
Answer
Answer: False
Question 7.
Anabaena is listed in the category of algae.
Answer
Answer: False
Question 8.
Algae tend to develop on wet surfaces.
Answer
Answer: True
Question 9.
Amoebic dysentery is caused by algae.
Answer
Answer: False
Question 10.
A fungi is used in the production of alcohol.
Answer
Answer: True
Question 11.
Jellies, jams and squashes are preserved by adding vinegar to them.
Answer
Answer: False
Question 12.
Salt is used as a food preservative.
Answer
Answer: True
Question 13.
Oxygen alone constitutes 78% of air.
Answer
Answer: False
Question 14.
Mushroom is a fungus.
Answer
Answer: True
Question 15.
Oxygen and nitrogen make up 78% of the air.
Answer
Answer: False
Question 16.
All microbes are disease-causing.
Answer
Answer: False
Question 17.
Virus can only multiply in living cells.
Answer
Answer: True
Question 18.
Foot and mouth disease is a bacterial disease in animals.
Answer
Answer: False
Question 19.
Bacteria can be killed by the use of antibiotics.
Answer
Answer: True
Question 20.
Edward Jenner discovered the process of fermentation.
Answer
Answer: False
Question 21.
Microorganisms can be seen with naked eyes.
Answer
Answer: False
Question 22.
The bread dough rises because of the growth of yeast cells.
Answer
Answer: True
Question 23.
Algae contain chlorophyll and thus are autotrophs.
Answer
Answer: True
Match the Following
| Column I | Column II |
| 1. Lactobacillus | (a) Protozoa |
| 2. Aspergillus | (b) Small pox vaccine |
| 3. Spirogyra | (c) Fermentation |
| 4. Paramecium | (d) Nitrogen fixer |
| 5. Robert Koch | (e) Penicillin |
| 6. Louis Pasteur | (f) Algae |
| 7. Edward Jenner | (g) Fungi |
| 8. Alexander Fleming | (h) Preservatives |
| 9. Salt and sugar | (i) Bacteria |
| 10. Blue-green algae | (j) Anthrax bacterium |
Answer
Answer:
| Column I | Column II |
| 1. Lactobacillus | (i) Bacteria |
| 2. Aspergillus | (g) Fungi |
| 3. Spirogyra | (f) Algae |
| 4. Paramecium | (a) Protozoa |
| 5. Robert Koch | (j) Anthrax bacterium |
| 6. Louis Pasteur | (c) Fermentation |
| 7. Edward Jenner | (b) Small pox vaccine |
| 8. Alexander Fleming | (e) Penicillin |
| 9. Salt and sugar | (h) Preservatives |
| 10. Blue-green algae | (d) Nitrogen fixer |
| Column A | Column B |
| 1. Bread making | a. Nitrogen fixation |
| 2. Rhizobium | b. Yeast |
| 3. Alexander Fleming | c. Bacteria |
| 4. Proteus | d. Viral disease |
| 5. Polio | e. Antibiotics |
Answer
Answer:
| Column A | Column B |
| 1. Bread making | b. Yeast |
| 2. Rhizobium | a. Nitrogen fixation |
| 3. Alexander Fleming | e. Antibiotics |
| 4. Proteus | c. Bacteria |
| 5. Polio | d. Viral disease |
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