This quiz works best with JavaScript enabled. Home > Class 8 > Class 8 Science Chapter 2 Microorganisms Friend And Foe ā Quiz 3 š Homepage š Download PDF Books š Premium PDF Books Class 8 Science Chapter 2 Microorganisms Friend And Foe Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. 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. 3. 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. 4. 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. 5. Which instrument is used to observe microrganisms A) Stethoscope. B) Telescope. C) Microscope. D) Kaleidoscope. Show Answer Correct Answer: C) Microscope. 6. 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. 7. 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. 8. Coci are ..... shaped bacteria. A) Rod-Shaped. B) Round-Shaped. C) Spiral. D) None of the above. Show Answer Correct Answer: B) Round-Shaped. 9. 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. 10. 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. 11. 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. 12. Which of the following diseases is caused by a fungi? A) Citrus canker. B) Anthrax. C) Rust of wheat. D) Yellow vein mosaic. Show Answer Correct Answer: C) Rust of wheat. 13. Yeast is used in food items like: A) Paneer. B) Idli. C) Chapati. D) None of the above. Show Answer Correct Answer: B) Idli. 14. Which microorganism produces much of the oxygen that we breathe? A) Algae. B) Fungi. C) Protists. D) Bacteria. Show Answer Correct Answer: A) Algae. 15. Malaria is caused by which microorganism? A) Micrococccus. B) Plasmodium. C) Thiobacillus. D) Trypanosoma. Show Answer Correct Answer: B) Plasmodium. 16. Name a disease which is common in human and other animals A) Rabies. B) Anthrax. C) Social anxiety. D) Cholera. Show Answer Correct Answer: B) Anthrax. 17. Ingredients that are used to check the growth of microorganisms are called ..... A) Preservatives. B) Pathogens. C) Vaccine. D) Carriers. Show Answer Correct Answer: A) Preservatives. 18. Which of the following is a carrier of the dengue virus? A) Housefly. B) Female Anopheles mosquito. C) Cockroach. D) Butterfly. Show Answer Correct Answer: B) Female Anopheles mosquito. 19. 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. 20. Tetracyline is an example of ..... A) Vaccine. B) Pathogens. C) Antibiotics. D) Weedicides. Show Answer Correct Answer: C) Antibiotics. 21. 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. 22. Antibiotics A) Kill disease-causing microorganisms. B) Slow down the growth of disease-causing microorganisms. C) Convert sugar into alcohol. D) Speed up the growth of micoorganisms. Show Answer Correct Answer: A) Kill disease-causing microorganisms. 23. Which of the following diseases is not caused by Viruses? A) Cold. B) Influenza. C) Chicken Pox. D) Tuberculosis. Show Answer Correct Answer: D) Tuberculosis. 24. What is the role of Lactobacillus in curd formation? A) Spoilage. B) Fermentation. C) Decomposition. D) Pathogen. Show Answer Correct Answer: B) Fermentation. 25. Which microorganism causes AIDS? A) A protozoa. B) A bacteria. C) A virus. D) An algae. 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