Micro Organisms: Friend and Foe" for CBSE 8th class Biological Sciences: NMMS

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Micro Organisms: Friend and Foe" for CBSE 8th class Biological Sciences:




1. Which of the following microorganisms causes fermentation?

  • A) Virus
  • B) Bacteria
  • C) Fungi
  • D) Protozoa

2. Yeasts are useful in the production of:

  • A) Antibiotics
  • B) Vaccines
  • C) Bread and alcohol
  • D) Cheese

3. Which microorganism is used in the production of curd from milk?

  • A) Bacteria
  • B) Virus
  • C) Fungi
  • D) Protozoa

4. Penicillin is an antibiotic obtained from which microorganism?

  • A) Bacteria
  • B) Fungi
  • C) Virus
  • D) Protozoa

5. Nitrogen-fixing bacteria are important for:

  • A) Causing diseases
  • B) Decomposing organic matter
  • C) Fixing atmospheric nitrogen into soil
  • D) Producing alcohol

6. Which microorganism causes malaria?

  • A) Bacteria
  • B) Virus
  • C) Fungi
  • D) Protozoa

7. Antibiotics are effective against:

  • A) Fungi
  • B) Bacteria
  • C) Viruses
  • D) All of the above

8. Which microorganism is used in the production of alcohol?

  • A) Bacteria
  • B) Virus
  • C) Fungi
  • D) Protozoa

9. Which microorganism causes AIDS?

  • A) Bacteria
  • B) Virus
  • C) Fungi
  • D) Protozoa

10. Which microorganism is responsible for causing tuberculosis?

  • A) Bacteria
  • B) Virus
  • C) Fungi
  • D) Protozoa

11. Which microorganism is responsible for causing cholera?

  • A) Plasmodium
  • B) Vibrio cholerae
  • C) Rhizobium
  • D) Salmonella

12. Rhizobium bacteria are found in the root nodules of:

  • A) Rice plants
  • B) Leguminous plants
  • C) Wheat plants
  • D) Mango trees

13. Which of the following is not a use of microorganisms?

  • A) Baking
  • B) Medicine
  • C) Photosynthesis
  • D) Cleaning oil spills

14. A disease that spreads rapidly from person to person is called:

  • A) Endemic
  • B) Epidemic
  • C) Chronic
  • D) Deficiency disease

15. Which of these can survive in extreme conditions like hot springs and salty water?

  • A) Viruses
  • B) Fungi
  • C) Archaebacteria
  • D) Amoeba

16. Which microorganism is used to produce vaccines?

  • A) Inactive or weakened microbes
  • B) Fungi
  • C) Active viruses
  • D) Bacteria only

17. Which of the following is a harmful effect of microorganisms?

  • A) Making alcohol
  • B) Causing food spoilage
  • C) Making curd
  • D) Nitrogen fixation

18. The process of converting sugar into alcohol is called:

  • A) Digestion
  • B) Fermentation
  • C) Respiration
  • D) Preservation

19. Which method is not used to preserve food?

  • A) Pasteurization
  • B) Refrigeration
  • C) Fermentation
  • D) Contamination

20. Which of the following diseases is caused by a virus?

  • A) Typhoid
  • B) Tuberculosis
  • C) Polio
  • D) Cholera

21. Which of the following microorganisms has no cell structure and can reproduce only inside a host cell?

  • A) Bacteria
  • B) Fungi
  • C) Virus
  • D) Protozoa

22. Which microorganism helps in the decomposition of dead bodies?

  • A) Protozoa
  • B) Fungi
  • C) Viruses
  • D) Algae

23. What is the name of the microorganism that causes dengue?

  • A) Plasmodium
  • B) Dengue virus
  • C) Salmonella
  • D) Vibrio

24. Which of the following is a unicellular microorganism?

  • A) Algae
  • B) Mushroom
  • C) Amoeba
  • D) Earthworm

25. Which of the following helps in the preparation of antibiotics?

  • A) Lactobacillus
  • B) Rhizobium
  • C) Penicillium
  • D) Paramecium

26. Which group of microorganisms can live in the soil and fix atmospheric nitrogen?

  • A) Algae
  • B) Protozoa
  • C) Cyanobacteria and Rhizobium
  • D) Fungi

27. Which of the following is an example of a protozoan disease?

  • A) Common cold
  • B) Typhoid
  • C) Malaria
  • D) Cholera

28. Which of the following methods involves heating milk at high temperature for a short time to kill harmful microbes?

  • A) Boiling
  • B) Pasteurization
  • C) Canning
  • D) Drying

29. Which microorganism can be seen only with the help of an electron microscope?

  • A) Bacteria
  • B) Virus
  • C) Algae
  • D) Fungi

30. Which of the following diseases is caused by bacteria?

  • A) AIDS
  • B) Typhoid
  • C) Influenza
  • D) Chickenpox
Location: Mogalturu, Andhra Pradesh 534281, India

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