This quiz works best with JavaScript enabled. Home > Class 8 > Class 8 Science Chapter 2 Microorganisms Friend And Foe ā Quiz 2 š Homepage š Download PDF Books š Premium PDF Books Class 8 Science Chapter 2 Microorganisms Friend And Foe Quiz 2 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. When a disease carrying microorganism enters our body it is called. A) Pathogen. B) Antibody. C) Antigen. D) Germs. Show Answer Correct Answer: C) Antigen. 2. 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. 3. 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. 4. Which protozoa is green in color? A) Paramecium. B) Euglena. C) Trypanosoma. D) None of the above. Show Answer Correct Answer: B) Euglena. 5. Which microorganism is used in the baking industry? A) Viruses. B) Algae. C) Yeast. D) Bacteria. Show Answer Correct Answer: C) Yeast. 6. Harmful microorganisms are called ..... A) Pagothens. B) Antibodies. C) Pathogens. D) Biotics. Show Answer Correct Answer: C) Pathogens. 7. How is POLIO caused? A) Bacteria. B) Fungi. C) Virus. D) All of the above. Show Answer Correct Answer: C) Virus. 8. Measles is caused by ..... A) Protozoa. B) Bacteria. C) Virus. D) Fungi. Show Answer Correct Answer: C) Virus. 9. What type of diseases are caused by protozoa? A) Viral diseases. B) Parasitic diseases. C) Fungal diseases. D) Bacterial diseases. Show Answer Correct Answer: B) Parasitic diseases. 10. 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. 11. Father of modern microbiology A) Edward Jenner. B) Antonie van Leeuwenhoek. C) Robert Koch. D) Louis Pasteur. Show Answer Correct Answer: D) Louis Pasteur. 12. Influenza is also called as ..... A) Malaria. B) Flu. C) Meningitis. D) Tuberculosis. Show Answer Correct Answer: B) Flu. 13. Which of the following diseases is not caused by a virus? A) Cholera. B) Chicken pox. C) Polio. D) Influenza. Show Answer Correct Answer: A) Cholera. 14. What causes dough to rise when yeast is added into it? A) Carbon dioxide is released. B) Temperature of the dough increase. C) Amount of dough increase. D) Mount of yeast particle increase. Show Answer Correct Answer: A) Carbon dioxide is released. 15. What is the main purpose of pasteurization? A) To change color. B) To increase shelf life. C) To kill harmful microorganisms. D) To enhance flavor. Show Answer Correct Answer: C) To kill harmful microorganisms. 16. What is the significance of nitrogen fixation in agriculture? A) It increases soil fertility. B) It promotes plant growth. C) It reduces soil fertility. D) It causes diseases. Show Answer Correct Answer: A) It increases soil fertility. 17. Alcohol is produced with the help of A) Sodium chloride. B) Yeast. C) Nitrogen. D) Carbon dioxide. Show Answer Correct Answer: B) Yeast. 18. Amount of nitrogen in the atmosphere is A) 58%. B) 68%. C) 78%. D) 88%. Show Answer Correct Answer: C) 78%. 19. Which of the following disease is spread due to bacteria? A) Tuberculosis. B) Measles. C) Chicken pox. D) Ring worm. Show Answer Correct Answer: A) Tuberculosis. 20. 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. 21. A Bacteria responsible for curdling of milk is A) Rhizobium. B) Oscillatoria. C) Lactobacillus. D) Plasmodium. Show Answer Correct Answer: C) Lactobacillus. 22. What is pasteurization? A) A method of fermentation. B) A method of food preservation. C) A method of cleaning. D) A method of cooking. Show Answer Correct Answer: B) A method of food preservation. 23. 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. 24. ..... lives in the root nodules of leguminous plants to fix nitrogen from the air to the soil A) Lactobacillus Bacteria. B) Yeast. C) Fungus. D) Rhizobium Bacteria. Show Answer Correct Answer: D) Rhizobium Bacteria. 25. What do we call microorganisms that cause diseases? A) Probiotics. B) Antibiotics. C) Fermenters. D) Pathogens. 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