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 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 8 Science Chapter 2 Microorganisms Friend And Foe Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Cold, influenza and most cough are caused by ..... ? A) Bacteria. B) Viruses. C) Fungi. D) None of these. Show Answer Correct Answer: B) Viruses. 2. The pores in the bread is due to gas bubbles of A) Nitrogen. B) Carbon of Oxide. C) Nitrogen dioxide. D) Oxygen. Show Answer Correct Answer: B) Carbon of Oxide. 3. Which of the following is a mode of transmission for malaria and dengue? A) Cat. B) Mouse. C) Mosquito. D) Ants. Show Answer Correct Answer: C) Mosquito. 4. Milk is converted into powder by ..... A) Vacuum drying. B) Bottling. C) Dehydration. D) Canning. Show Answer Correct Answer: A) Vacuum drying. 5. What do antibiotics do? A) Increase acidity. B) Promote growth. C) Kill or inhibit bacteria. D) Enhance flavor. Show Answer Correct Answer: C) Kill or inhibit bacteria. 6. Which of the following bacterium is involved in the fixation of nitrogen in leguminous plants? A) They exhibited chill. B) Bacillus. C) Rhizobium. D) Spirillum. Show Answer Correct Answer: C) Rhizobium. 7. Which microorganism is used in the preparation of curd? A) Lactobacillus. B) E. coli. C) Streptococcus. D) Bacillus. Show Answer Correct Answer: A) Lactobacillus. 8. When left open, bread gets spoilt in the rainy season due to the accumulation of ..... A) Fungi. B) Protozoa. C) Algae. D) Bacteria. Show Answer Correct Answer: A) Fungi. 9. Which cannot fix atmospheric nitrogen in the soil? A) Azotobacter. B) Penicillin. C) All the above. D) None of the above. Show Answer Correct Answer: B) Penicillin. 10. Bacteria are involved in making of cheese A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 11. Which of the following is a common carrier of disease-causing microbes? A) Houseflies. B) Bees. C) Butterflies. D) Ants. Show Answer Correct Answer: A) Houseflies. 12. The disease caused by fungi is ..... A) Ring worm. B) Polio. C) Chicken pox. D) Measles. Show Answer Correct Answer: A) Ring worm. 13. Which microorganism is responsible for causing malaria? A) Fungi. B) Bacteria. C) Protozoa. D) Virus. Show Answer Correct Answer: C) Protozoa. 14. Diseases like cold, flu, chicken pox etc are caused by which microbe? A) Fungi. B) Bacteria. C) Virus. D) Archaea. Show Answer Correct Answer: C) Virus. 15. Cocci are ..... shaped bacteria. A) Rod-Shaped. B) Round-Shaped. C) Spiral. D) None of the above. Show Answer Correct Answer: B) Round-Shaped. 16. Cholera is spread through ..... A) Food. B) Water. C) Air and food. D) Food and water. Show Answer Correct Answer: D) Food and water. 17. Which one of the following promotes the formation of curd A) Yeast. B) Probiotic. C) Archaea. D) Lactobacillus. Show Answer Correct Answer: D) Lactobacillus. 18. Which friendly microorganism lives in our intestine? A) E.Coli:Bacteria. B) Lactobacilli:Protozoa. C) Lactobacillus:Bacteria. D) E. coli:fungi. Show Answer Correct Answer: A) E.Coli:Bacteria. 19. Name the nizime to be resiased by the organisms that helps uplide the fibers? Which Enzyme is Secreme is SCARTED BY BACYME IS SECTING OF THAT OF Flax The Ratting of Flax Flax Flax Fibras? A) Ampelez Amylase. B) Priority Protease. C) Packetanege pectinase. D) Solulage Cellulars. Show Answer Correct Answer: D) Solulage Cellulars. 20. Which was the first antibiotic to be discovered A) Crocin. B) Penicillin. C) Ayurveda. D) None of the above. Show Answer Correct Answer: B) Penicillin. 21. Yeast is NOT used for the production of: A) Wine. B) Bread. C) Acetic acid. D) None of the above. Show Answer Correct Answer: D) None of the above. 22. A bacteria that helps in the synthesis of vitamin B complex in our body is ..... A) They exhibited chill. B) Clostridium. C) Euglena. D) None of these. Show Answer Correct Answer: A) They exhibited chill. 23. When a disease carrying microorganism enters our body it is called. A) Pathogen. B) Germs. C) Antibody. D) Antigen. Show Answer Correct Answer: D) Antigen. 24. Yeast requires which of the following ingredients for activation? A) Sugar and Vinegar. B) Sugar and Water. C) Salt and Vinegar. D) Salt and Water. Show Answer Correct Answer: B) Sugar and Water. 25. Penicillin antibiotic is obtained from fungi A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 26. Which protozoa is green in color? A) Paramecium. B) Euglena. C) Trypanosoma. D) None of the above. Show Answer Correct Answer: B) Euglena. 27. Which microorganism is used in the baking industry? A) Bacteria. B) Viruses. C) Yeast. D) Algae. Show Answer Correct Answer: C) Yeast. 28. Harmful microorganisms are called ..... A) Biotics. B) Antibodies. C) Pathogens. D) Pagothens. Show Answer Correct Answer: C) Pathogens. 29. How is POLIO caused? A) Bacteria. B) Fungi. C) Virus. D) All of the above. Show Answer Correct Answer: C) Virus. 30. Measles is caused by ..... A) Virus. B) Fungi. C) Bacteria. D) Protozoa. Show Answer Correct Answer: A) Virus. 31. What type of diseases are caused by protozoa? A) Fungal diseases. B) Viral diseases. C) Bacterial diseases. D) Parasitic diseases. Show Answer Correct Answer: D) Parasitic diseases. 32. Which one of the the following discovered Fermentation A) Alexander Fleming. B) Edward Jenner. C) Robert Koch. D) Louis Pasteur. Show Answer Correct Answer: D) Louis Pasteur. 33. Influenza is also called as ..... A) Malaria. B) Tuberculosis. C) Flu. D) Meningitis. Show Answer Correct Answer: C) Flu. 34. Which of the following diseases is not caused by a virus? A) Influenza. B) Chicken pox. C) Polio. D) Cholera. Show Answer Correct Answer: D) Cholera. 35. Scientist who discovered the fermentation ..... A) Alexander Fleming. B) Louis Pasteur. C) John Mendel. D) Charles Darwin. Show Answer Correct Answer: B) Louis Pasteur. 36. What causes dough to rise when yeast is added into it? A) Mount of yeast particle increase. B) Temperature of the dough increase. C) Amount of dough increase. D) Carbon dioxide is released. Show Answer Correct Answer: D) Carbon dioxide is released. 37. What is the main purpose of pasteurization? A) To increase shelf life. B) To change color. C) To kill harmful microorganisms. D) To enhance flavor. Show Answer Correct Answer: C) To kill harmful microorganisms. 38. What is the significance of nitrogen fixation in agriculture? A) It causes diseases. B) It increases soil fertility. C) It reduces soil fertility. D) It promotes plant growth. Show Answer Correct Answer: B) It increases soil fertility. 39. Alcohol is produced with the help of A) Sodium chloride. B) Yeast. C) Carbon dioxide. D) Nitrogen. Show Answer Correct Answer: B) Yeast. 40. Amount of nitrogen in the atmosphere is A) 88%. B) 58%. C) 78%. D) 68%. Show Answer Correct Answer: C) 78%. 41. Which of the following disease is spread due to bacteria? A) Chicken pox. B) Measles. C) Tuberculosis. D) Ring worm. Show Answer Correct Answer: C) Tuberculosis. 42. Squashes and jams are preserved by adding salt. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 43. A Bacteria responsible for curdling of milk is A) Oscillatoria. B) Rhizobium. C) Plasmodium. D) Lactobacillus. Show Answer Correct Answer: D) Lactobacillus. 44. What is pasteurization? A) A method of cooking. B) A method of food preservation. C) A method of cleaning. D) A method of fermentation. Show Answer Correct Answer: B) A method of food preservation. 45. Where do microorganisms live? A) In hot water. B) In sea. C) In Marshy lands. D) All of these. Show Answer Correct Answer: D) All of these. 46. Malaria is caused by ..... A) Virus. B) Algae. C) Bacteria. D) Protozoa. Show Answer Correct Answer: D) Protozoa. 47. ..... lives in the root nodules of leguminous plants to fix nitrogen from the air to the soil A) Lactobacillus Bacteria. B) Fungus. C) Rhizobium Bacteria. D) Yeast. Show Answer Correct Answer: C) Rhizobium Bacteria. 48. What do we call microorganisms that cause diseases? A) Antibiotics. B) Probiotics. C) Pathogens. D) Fermenters. Show Answer Correct Answer: C) Pathogens. 49. When left for longer hours to set, curd gets ..... A) Tinner. B) Thicker. C) All the above. D) None of the above. Show Answer Correct Answer: B) Thicker. 50. Microorganisms are used in the preparation of curd, bread, alcohol and cake A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 51. How are viruses different from other microbes? A) They live only individually. B) They can kill other microorganisms like bacteria. C) They are very small and can only be seen under an electron microscope. D) All of the above. Show Answer Correct Answer: D) All of the above. 52. Vaccine for small pox is discorvered by ..... A) Louis Pasteur. B) Alexander Fleming. C) Edward Jenner. D) Louis Pasteur. Show Answer Correct Answer: C) Edward Jenner. 53. Which instrument is used to observe microrganisms A) Kaleidoscope. B) Stethoscope. C) Microscope. D) Telescope. Show Answer Correct Answer: C) Microscope. 54. Some medicines obtained from micro-organisms are applied to kill or stop the growth of disease-causing microorganisms. Such medicines are called ..... A) Antibodies. B) Antibiotics. C) Antiseptics. D) All of the above. Show Answer Correct Answer: B) Antibiotics. 55. What does yeast produce during respiration? A) Carbon dioxide. B) Nitrogen. C) Hydrogen. D) None of the above. Show Answer Correct Answer: A) Carbon dioxide. 56. Coci are ..... shaped bacteria. A) Rod-Shaped. B) Round-Shaped. C) Spiral. D) None of the above. Show Answer Correct Answer: B) Round-Shaped. 57. Name a human disease caused by viruses A) Polio. B) Malaria. C) All the above. D) None of the above. Show Answer Correct Answer: A) Polio. 58. Vaccine for smallpox is discovered by ..... A) Louis Pasteur. B) Alexander Fleming. C) Edward Jenner. D) John Mendel. Show Answer Correct Answer: C) Edward Jenner. 59. Common bread mould is a fungi, which exhibits saprophytic mode of nutrition. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 60. Yeast is used in food items like: A) Paneer. B) Idli. C) Chapati. D) None of the above. Show Answer Correct Answer: B) Idli. Next →Related QuizzesScience QuizzesClass 8 QuizzesClass 8 Science Chapter 2 Microorganisms Friend And Foe Quiz 2Class 8 Science Chapter 2 Microorganisms Friend And Foe Quiz 3 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books