This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 10 Microbes In Human Welfare – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 9 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Assertion (A):Disadvantages of synthetic pesticides can be overcome by the use of natural or biopesticidesReason(R):Biopesticides are harmless agents which are used to control weeds and pest without damage. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true But R is not correct explanation of A. C) A is true, but R is false. D) Both A and R are false. Show Answer Correct Answer: B) Both A and R are true But R is not correct explanation of A. 2. Citric acid is produced by Aspergillus niger, which is a: A) Bacterium. B) Fungus. C) Yeast. D) Protozoan. Show Answer Correct Answer: B) Fungus. 3. Which industrial products are synthesized from microbes?A. AntibioticsB. Fermented beveragesC. Enzymes and chemicalsD. Bioactive molecules A) A, C, D. B) A, B, C, D. C) A, C. D) A, B, C. Show Answer Correct Answer: B) A, B, C, D. 4. Antibiotics will only kill ..... A) Viruses. B) Bacteria. C) Fungus. D) None of the above. Show Answer Correct Answer: B) Bacteria. 5. Which are examples of fungi? A) Mold. B) Yeast. C) Mushrooms. D) All of the above. Show Answer Correct Answer: D) All of the above. 6. Rotenone is a A) Bioherbicide. B) Biofertiliser. C) Bioinsecticide. D) Juvenile hormone. Show Answer Correct Answer: C) Bioinsecticide. 7. State the function of cyclosporin A A) Removal of oil stains. B) Removal of clots from blood vessels. C) Lowering of blood cholesterol. D) Immuno-suppressive agent. Show Answer Correct Answer: D) Immuno-suppressive agent. 8. Example of a natural insect repellant A) Citronella oil. B) Coconut oil. C) Linseed oil. D) None of the above. Show Answer Correct Answer: A) Citronella oil. 9. KVIC stands for A) Khadi and village Institution Commission. B) Khadi and Village Industries Company. C) Khadi and Village Industries Commission. D) Kanpur and Vallore industries Commission. Show Answer Correct Answer: C) Khadi and Village Industries Commission. 10. Streptomycin is produced from- A) Streptomyces scoleus. B) Streptomyces griseus. C) Streptomyces fradiae. D) Streptomyces venezuellae. Show Answer Correct Answer: B) Streptomyces griseus. 11. What gases are produced in anaerobic sludge digesters? A) Methane and CO$_{2}$ only. B) Methane, Hydrogen sulphide and CO$_{2}$. C) Methane, hydrogen sulphide and O$_{2}$. D) Hydrogen sulphide and CO$_{2}$. Show Answer Correct Answer: B) Methane, Hydrogen sulphide and CO$_{2}$. 12. Which of the following organisms is used in the production of beverages? A) Penicillium notatum. B) Saccharomyces cerevisiae. C) Aspergillus niger. D) Clostridium butylicum. Show Answer Correct Answer: B) Saccharomyces cerevisiae. 13. ..... is a pigment that gives a pinkish hue to rhizobium induced root nodules. A) Leghaemoglobin. B) Carotenoid. C) Mauveine. D) None of the above. Show Answer Correct Answer: A) Leghaemoglobin. 14. The oily stains from laundry can be removed by A) Lipases. B) Esterase. C) Ligases. D) Endonuclease. Show Answer Correct Answer: A) Lipases. 15. Gases produced in anaerobic sludge digestors are A) Methane, oxygen and hydrogen sulphide. B) Hydrogen sulphide, methane and sulphur dioxide. C) Hydrogen sulphide, nitrogen and methane. D) Methane, Hydrogen Sulphide and CO2. Show Answer Correct Answer: D) Methane, Hydrogen Sulphide and CO2. 16. Fungi are important to an ecosystem as A) Producers. B) Controllers. C) Decomposers. D) Regulators. Show Answer Correct Answer: C) Decomposers. 17. In primary treatment, all solids that settle form the ..... , and the supernatant forms the ..... A) Primary sludge; Effluent. B) Secondary sludge; Effluent. C) Primary effluent; Secondary sludge. D) Tertiary sludge; Effluent. Show Answer Correct Answer: A) Primary sludge; Effluent. 18. BOD stands for Biochemical Oxygen Demand. A high BOD value in a water sample indicates: A) Low polluting potential. B) The water is pure. C) High polluting potential. D) Low organic matter content. Show Answer Correct Answer: C) High polluting potential. 19. Which of the following is not involved in nitrogen fixation? A) Anabena. B) Nostoc. C) Oscillatoria. D) Pseudomonas. E) Azetobacter. Show Answer Correct Answer: D) Pseudomonas. 20. Which of the following is the pair of biofertilizers? A) Anabaena and Azotobacter. B) Nostoc and legume. C) Rhizobium and grasses. D) Salmonella & E. coli. Show Answer Correct Answer: A) Anabaena and Azotobacter. 21. Microbes are present in-A. SoilB. AirC. WaterD. Thermal springs A) A, C, D. B) A, B, C, D. C) A, B. D) C, D. Show Answer Correct Answer: B) A, B, C, D. 22. The large holes in 'Swiss cheese' are due to production of a large amount of CO ..... 2 by a: A) Fungus named Penicillium roqueforti. B) Bacterium named Propionibacterium sharmanii. C) Yeast named Saccharomyces cerevisiae. D) Bacterium named Lactobacillus. Show Answer Correct Answer: B) Bacterium named Propionibacterium sharmanii. 23. Alexander Fleming was working on A) Salmonella. B) Penicillin notatum. C) Streptococcus. D) Staphylococci. Show Answer Correct Answer: D) Staphylococci. 24. High biological oxygen demand in a water body means ..... A) Water is not polluted. B) Water is polluted. C) Waterbody contains lots of lifeforms. D) Waterbody is suitable for animals to live in. Show Answer Correct Answer: B) Water is polluted. 25. The primary treatment of waste water involves the removal of: A) Dissolved impurities. B) Stable particles. C) Toxic substances. D) Harmful bacteria. Show Answer Correct Answer: B) Stable particles. ← PreviousNext →Related QuizzesClass 12 Biology Chapter 10 Microbes In Human Welfare Quiz 1Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 2Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 3Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 4Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 5Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 6Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 7Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 8Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 10Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books