This quiz works best with JavaScript enabled. Home > Cbse > Class 8 > Science > Microorganisms Friend And Foe > Class 8 Science Chapter 2 Microorganisms Friend And Foe – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 8 Science Chapter 2 Microorganisms Friend And Foe Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which microorganism produces much of the oxygen that we breathe? A) Protists. B) Fungi. C) Bacteria. D) Algae. Show Answer Correct Answer: D) Algae. 2. Malaria is caused by which microorganism? A) Thiobacillus. B) Plasmodium. C) Micrococccus. D) Trypanosoma. Show Answer Correct Answer: B) Plasmodium. 3. Name a disease which is common in human and other animals A) Anthrax. B) Social anxiety. C) Rabies. D) Cholera. Show Answer Correct Answer: A) Anthrax. 4. Ingredients that are used to check the growth of microorganisms are called ..... A) Preservatives. B) Vaccine. C) Pathogens. D) Carriers. Show Answer Correct Answer: A) Preservatives. 5. Which of the following is a carrier of the dengue virus? A) Butterfly. B) Cockroach. C) Female Anopheles mosquito. D) Housefly. Show Answer Correct Answer: C) Female Anopheles mosquito. 6. Which is not a food preserving method A) Preservation by citric acid. B) Preservation by heating. C) Preserving by water. D) None of the above. Show Answer Correct Answer: C) Preserving by water. 7. Tetracyline is an example of ..... A) Antibiotics. B) Pathogens. C) Weedicides. D) Vaccine. Show Answer Correct Answer: A) Antibiotics. 8. Fungi get their food through photosynthesis. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 9. What is the role of Lactobacillus in curd formation? A) Decomposition. B) Fermentation. C) Spoilage. D) Pathogen. Show Answer Correct Answer: B) Fermentation. 10. Which microorganism causes AIDS? A) A virus. B) A bacteria. C) An algae. D) A protozoa. Show Answer Correct Answer: A) A virus. 11. What is denitrification A) Conversion of nitrates into free nitrogen gas. B) Conversion of nitrates into compounds like proteins. C) Conversion of nitrates into inorganic compounds. D) None of the above. Show Answer Correct Answer: A) Conversion of nitrates into free nitrogen gas. 12. Cold, Influenza are caused by A) Virus. B) Protozoa. C) Both a and b. D) None of the above. Show Answer Correct Answer: A) Virus. 13. Which of the following drug is an antipyretic? A) Alcohol. B) Paracetamol. C) Insulin. D) Streptomycin. Show Answer Correct Answer: B) Paracetamol. 14. Tuberculosis are caused by ..... A) Bacteria. B) Virus. C) Protozoa. D) None. Show Answer Correct Answer: A) Bacteria. 15. Who discovered the virtue? Who Discovered the Virus? A) Wandel Stanley wendell Stanley. B) Robert Hook Robert Hook. C) Anton Van Lauvenhak Antonie Van Leewenhoek. D) Edward Jinner Edward Jenner. Show Answer Correct Answer: A) Wandel Stanley wendell Stanley. 16. Which one of the following Microbes only reproduce inside the cells of the host organism A) Bacteria. B) Protozoa. C) Algae. D) Virus. Show Answer Correct Answer: D) Virus. 17. What is protozoan? A) A microorganism cause for AIDS. B) A microorganism cause for Hepatitis A. C) A microorganism cause for TB. D) A microorganisms cause for malaria. Show Answer Correct Answer: D) A microorganisms cause for malaria. 18. The holes in bread are formed because of the release of ..... A) Carbon dioxide. B) Nitrogen dioxide. C) Carbon monoxide. D) Nitrogen Monoxide. Show Answer Correct Answer: A) Carbon dioxide. 19. Who discovered PENICILLIN and when? A) Louis Pasteur in 1954. B) Edward Jenner in 1935. C) Alexander Fleming in 1929. D) None of the above. Show Answer Correct Answer: C) Alexander Fleming in 1929. 20. The bacterium involved in the fixation of nitrogen in leguminous plants is A) Yeast. B) Amoeba. C) Lactobacillus. D) Rhizobium. Show Answer Correct Answer: D) Rhizobium. 21. The other name of denitrifying bacteria is ..... A) Pseudomonas. B) Nitrobacter. C) Rhizobium. D) Nitrosomonas. Show Answer Correct Answer: A) Pseudomonas. 22. Antrax disease is caused by ..... A) Protozoa. B) Virus. C) Bacteria. D) Fungi. Show Answer Correct Answer: C) Bacteria. 23. Penicillin is obtained from a A) Bacteria. B) Algae. C) Fungus. D) Vaccine. Show Answer Correct Answer: C) Fungus. 24. There Are Some Characteristics Of Tuberculosis Patient. Choose The Incorrect One: A) Tuberculosis is infectious airborne disease. B) We should avoid standing when the any person cough. C) It is caused by lactobacillus bacteria. D) All of the above. Show Answer Correct Answer: C) It is caused by lactobacillus bacteria. 25. In Pasteurization milk is boiled to ..... for 15 to 30 seconds and then suddenly chilled and stored A) 70$^\circ$C. B) 30$^\circ$C. C) 100$^\circ$C. D) 50$^\circ$C. Show Answer Correct Answer: A) 70$^\circ$C. 26. Yeast, mold, and mushrooms are part of which category of microorganisms? A) Protists. B) Bacteria. C) Fungi. D) Viruses. Show Answer Correct Answer: C) Fungi. 27. What is the subtleivies called disease? Which of The Following Term is Given to The Microorganisms Ita Diseases? A) Antibody antibodies. B) Darken Vectors. C) Patient pathogen. D) Antigugen antigens. Show Answer Correct Answer: C) Patient pathogen. 28. Nitrogen has ..... gas A) 98. B) 20. C) 19. D) 78. Show Answer Correct Answer: D) 78. 29. Which of the following cannot be considered as a microbe? A) Spirogyra. B) Aspergillus. C) Aedes. D) Blue green algae. Show Answer Correct Answer: C) Aedes. 30. In case of vaccination, antibodies are injected into the body of patients suffering from the disease A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 31. Our atmosphere has ..... % of nitrogen A) 71. B) 76. C) 78. D) 75. Show Answer Correct Answer: C) 78. 32. Microrganisms can only be found in hot places A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 33. Which of the following is a characteristic of bacteria? A) They are quite small and live individually. B) They are very small and exist in colonies. C) They can also live in host bodies. D) They are usually multicellular. Show Answer Correct Answer: B) They are very small and exist in colonies. 34. The method of preserving food by adding salt is called ..... A) Freezing. B) Salting. C) Canning. D) Dehydration. Show Answer Correct Answer: B) Salting. 35. What is the main function of microorganisms in the nitrogen cycle? A) Causing diseases. B) Fixing nitrogen. C) Decomposing waste. D) Producing oxygen. Show Answer Correct Answer: B) Fixing nitrogen. 36. What is the role of Rhizobium in agriculture? A) Causing diseases. B) Fixing nitrogen. C) Decomposing organic matter. D) Producing antibiotics. Show Answer Correct Answer: B) Fixing nitrogen. 37. Atmospheric nitrogen is used for the synthesis of ..... A) Alcohol. B) Animal protein. C) Plant carbohydrates. D) Plant protein. Show Answer Correct Answer: D) Plant protein. 38. Polio, chicken pox and AIDS are caused by different ..... A) Algae. B) Fungi. C) Viruses. D) Bacteria. Show Answer Correct Answer: C) Viruses. 39. Communicable diseases do not spread through ..... A) Air. B) Physical contact. C) Food. D) Online interaction. Show Answer Correct Answer: D) Online interaction. 40. Blue-green algae can fix atmospheric ..... in the soil A) Carbon. B) Nitrogen. C) Oxygen. D) All of the above. Show Answer Correct Answer: B) Nitrogen. 41. Citrus Canker is caused by which microorganism? A) Xanthomonas:Virus. B) Xanthomonas:Bacteria. C) Xanthomonas:Fungi. D) Bacilli Canker:Bacteria. Show Answer Correct Answer: B) Xanthomonas:Bacteria. 42. ..... There are both attributes of both plants and plants ..... . Possess The Characteristics of Both Animals and Plants. A) Diantum Diatoms. B) Spirauty spirgyra. C) Paramaticium Paramecium. D) Uglina Euglena. Show Answer Correct Answer: A) Diantum Diatoms. 43. What is the main purpose of using preservatives in food? A) To enhance flavor. B) To change color. C) To increase nutrition. D) To prevent spoilage. Show Answer Correct Answer: D) To prevent spoilage. 44. Which of the following diseases is caused by a virus? A) Dysentery. B) Cholera. C) Chicken Pox. D) Tuberculosis. Show Answer Correct Answer: C) Chicken Pox. 45. Viruses can be seen through naked eye an can cause diseases like cholera and typhoid. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 46. Which of the following can be used to preserve food items? A) Common salt. B) Sodium benzoate. C) Sodium metabisulphite. D) All of these. Show Answer Correct Answer: D) All of these. 47. What is the primary way that pathogens enter the human body? A) Through water. B) Through exercise. C) Through sunlight. D) Through the air. Show Answer Correct Answer: D) Through the air. 48. These are dead or weakened microbes introduced to a healthy body where the body fights or kills the invading microbes by producing suitable antibodies is called A) Tuberculosis. B) Pathogens. C) Vaccination. D) Hepatitis. Show Answer Correct Answer: C) Vaccination. 49. Penicillium belongs to a group called A) Bacteria. B) Viruses. C) Algae. D) Fungi. Show Answer Correct Answer: D) Fungi. 50. What are microorganisms commonly referred to as? A) Bacteria. B) Microbes. C) Fungi. D) Viruses. Show Answer Correct Answer: B) Microbes. 51. The status of algae in the aquatic food chain is A) Consumers. B) Producers. C) Host. D) Small in size. Show Answer Correct Answer: C) Host. 52. Algae in latin means ..... A) Sea plants. B) Sea organisms. C) Sea weeds. D) None of the above. Show Answer Correct Answer: C) Sea weeds. 53. Polio drops given to children is actually an antibiotic. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 54. Casein coagulation takes place when milk is? A) Neutral. B) Basic. C) Acidic. D) None of the above. Show Answer Correct Answer: C) Acidic. 55. What is the primary benefit of using antibiotics? A) To kill disease-causing microorganisms. B) To promote growth. C) To enhance flavor. D) To increase soil fertility. Show Answer Correct Answer: A) To kill disease-causing microorganisms. 56. Most of the fungi are ..... while some are parasites. A) Saprophytes. B) Hectrophytes. C) Protistas. D) None of the above. Show Answer Correct Answer: A) Saprophytes. 57. Food Poisoning is caused due to the consumption of food spoilt by some microbes A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 58. Which of the following is NOT a major group of microorganisms? A) Mammals. B) Bacteria. C) Protozoa. D) Fungi. Show Answer Correct Answer: A) Mammals. 59. Microbes are classified into ..... major groups A) 4. B) 10. C) 6. D) 2. E) 3. Show Answer Correct Answer: A) 4. 60. What is the study of microorganisms called? A) Microbiologists. B) Microbiology. C) Biology. D) Both 1 and 2. Show Answer Correct Answer: B) Microbiology. ← PreviousNext →Related QuizzesScience QuizzesClass 8 QuizzesClass 8 Science Chapter 2 Microorganisms Friend And Foe Quiz 1Class 8 Science Chapter 2 Microorganisms Friend And Foe Quiz 3 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books