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MCQ Questions for class 8 Science Microorganisms : friend and foe

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Below is the Quiz for class 8 Science chapter Microorganisms : friend and foe. You can Tap on the Start Quiz to begin playing the MCQs.

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Total Questions: 10

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Q1. The process of conversion of sugar into alcohol is known as ________

  1. Fermentation
  2. Baking
  3. Both A and B
  4. None of these
Answer: Fermentation

Q2. Who discovered fermentation?

  1. Alexander Fleming
  2. Louis Pasteur
  3. Edward Jenner
  4. Robert Köch
Answer: Louis Pasteur

Q3. Who discovered the vaccine of small pox?

  1. Louis Pasteur
  2. Robert Köch
  3. Edward Jenner
  4. Alexander Fleming
Answer: Edward Jenner

Q4. What is use of antibiotics?

  1. It is used in making chocolate
  2. It is used to clean water
  3. Both A and B
  4. It is used to kill or stop the growth of disease caused by microorganisms
Answer: It is used to kill or stop the growth of disease caused by microorganisms

Q5. Microorganisms can be seen with the help of a ____________

  1. Microscope
  2. Telescope
  3. Thermometer
  4. Odometer
Answer: Microscope

Q6. Blue green algae fix __________ directly from air and enhance fertility of soil.

  1. Oxygen
  2. Carbon dioxide
  3. Carbohydrates
  4. Nitrogen
Answer: Nitrogen

Q7. Alcohol is produced with the help of __________

  1. Yeast
  2. Blue green algae
  3. Virus
  4. All of these
Answer: Yeast

Q8. Cholera is caused by __________

  1. Virus
  2. Protozoa
  3. Bacteria
  4. Algae
Answer: Bacteria

Q9. Yeast is used in the production of

  1. Sugar
  2. Alcohol
  3. Hydrochloric acid
  4. Oxygen
Answer: Alcohol

Q10. The following is an antibiotic

  1. Sodium bicarbonate
  2. Streptomycin
  3. Alcohol
  4. Yeast
Answer: Streptomycin

Q11. Carrier of malaria-causing protozoan is

  1. Female Anopheles mosquito
  2. Cockroach
  3. Housefly
  4. Butterfly
Answer: Female Anopheles mosquito

Q12. The most common carrier of communicable diseases is

  1. Ant
  2. Housefly
  3. Dragonfly
  4. Spider
Answer: Housefly

Q13. The bread or idli dough rises because of

  1. Heat
  2. Grinding
  3. Growth of yeast cells
  4. Kneading
Answer: Growth of yeast cells

Q14. Microbial diseases that can spread from an infected person to a healthy person through air, water, food or physical contact are called ____________

  1. Communicable diseases
  2. Fermentation
  3. Microorganisms
  4. None of these
Answer: Communicable diseases

Q15. Which method is used to preserve milk?

  1. Salting
  2. Drying
  3. Oiling
  4. Pasteurisation
Answer: Pasteurisation

Q16. Which bacteria fixes nitrogen in the soil?

  1. Paramecium
  2. Rhizobium
  3. Ameoba
  4. Spirogyra
Answer: Rhizobium

Q17. What is nitrogen cycle?

  1. Using of nitrogen in industries
  2. Circulation of water from atmosphere to soil
  3. Both A and B
  4. The circulation of nitrogen from atmosphere to soil
Answer: The circulation of nitrogen from atmosphere to soil

Q18. Typhoid is caused by _________

  1. Bacteria
  2. Virus
  3. Algae
  4. None of these
Answer: Bacteria

Q19. What are pathogens?

  1. It increases soil fertility
  2. It fixes nitrogen
  3. The microorganisms which cause diseases in human beings, plants and animals
  4. None of these
Answer: The microorganisms which cause diseases in human beings, plants and animals

Q20. What is antibodies?

  1. It helps in digestion of food
  2. It helps in blood clotting
  3. Antibodies helps in circulation of blood
  4. Antibodies fight against microbes
Answer: Antibodies fight against microbes

Q21. Some bacteria are able to fix nitrogen from the atmosphere to enrich soil with nitrogen and increase its fertility. These microbes are commonly called __________

  1. Biological nitrogen fixers
  2. Algae
  3. Antibodies
  4. None of these
Answer: Biological nitrogen fixers