This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 10 Microbes In Human Welfare – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which one of the following helps in the absorption ofphosphorus from the soil by plants? A) Anabaena. B) Glomus. C) Rhizobium. D) Frankia. Show Answer Correct Answer: B) Glomus. 2. The Ganga and Yamuna action plan was launched in ..... respectively. A) 1983 & 1996. B) 1986 & 1993. C) 1984 & 1992. D) 1988 & 1973. Show Answer Correct Answer: B) 1986 & 1993. 3. Biofertilizers are organisms that: A) Kill pests. B) Enrich the nutrient quality of the soil. C) Degrade the soil. D) Produce biogas. Show Answer Correct Answer: B) Enrich the nutrient quality of the soil. 4. Antibiotic resistance is accelerated by A) Misuse of antibiotics. B) Over use of antibiotics. C) Poor infection prevention control. D) Both a and b. E) All the above. Show Answer Correct Answer: E) All the above. 5. The bacteria that grow on milk and convert it into curd A) Clostridium. B) Lactobacillus. C) Nitrosomonas. D) Acetobacter. Show Answer Correct Answer: B) Lactobacillus. 6. Large holes in Swiss cheese is due to the production of large amount of carbon-di-oxide by the bacterium A) Saccharomyces cerevisiae. B) Leuconostoc mesenteroides. C) Lactobacillus bulgaricus. D) Propionibacterium shermanii. Show Answer Correct Answer: D) Propionibacterium shermanii. 7. Ethanol is commercially produced through a particular species of A) Clostridium. B) Trichoderma. C) Aspergillus. D) Saccharomyces. Show Answer Correct Answer: D) Saccharomyces. 8. The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is A) Vitamin C. B) Vitamin D. C) Vitamin B12. D) Vitamin E. Show Answer Correct Answer: C) Vitamin B12. 9. Which one of the following is not used in organic farming? A) Snail. B) Oscillatoria. C) Glomus. D) Earthworm. Show Answer Correct Answer: A) Snail. 10. Which of the following bacteria help in nitrogen fixation from atmosphere?A. AzotobacterB. RhizobiumC. AzospirillumD. Lactobacillus A) A, C, D. B) A, B, C, D. C) B, C, D. D) A, B, C. Show Answer Correct Answer: D) A, B, C. 11. Why is wine distilled? A) To reduce toxicity. B) To enable fermentation. C) To prevent spoilage. D) To increase the alcohol percentage. Show Answer Correct Answer: D) To increase the alcohol percentage. 12. What does a high value of BOD(Biochemical Oxygen Demand) indicate? A) That water is pure. B) That water is less polluted. C) That water is highly polluted. D) That consumption of organic matter by microbes is higher in the water. Show Answer Correct Answer: C) That water is highly polluted. 13. The mixture of gases released during anaerobic digestion of sludge is called A) Methane. B) Carbon dioxide. C) Biogas. D) Flammable gases. Show Answer Correct Answer: C) Biogas. 14. The symbiotic association between fungi and roots of higher plants is called A) Lichen. B) Mycorrhiza. C) Biofertilizer. D) Biopesticides. Show Answer Correct Answer: B) Mycorrhiza. 15. The free-living fungus Trichoderma can be used for: A) Killing insects. B) Biological control of plant diseases. C) Controlling butterfly caterpillars. D) Producing antibiotics. Show Answer Correct Answer: B) Biological control of plant diseases. 16. Identify the source of statins: A) Trichoderma polysporum. B) Monascus purpureus. C) Saccharomyces cerevisiae. D) Streptococcus. Show Answer Correct Answer: B) Monascus purpureus. 17. In cheese manufacture, the micro-organisms are used for- A) The souring of milk only. B) The ripening only. C) Development of resistance to spoilage. D) Both a and b. Show Answer Correct Answer: D) Both a and b. 18. Antibiotics are the most effective on: A) Bacteria. B) Virus. C) Fungi. D) None of the above. Show Answer Correct Answer: A) Bacteria. 19. The grit (soil and small pebbles) are removed by A) Filtration. B) Sedimentation. C) UV radiation. D) Agitation. Show Answer Correct Answer: B) Sedimentation. 20. The remaining major part of activated sludge is pumped into large tanks called ..... A) Aerobic fermenters. B) Anaerobic fermenters. C) Aerobic Sludge digesters. D) Anaerobic sludge digesters. Show Answer Correct Answer: D) Anaerobic sludge digesters. 21. Identify the source of Acetic acid: A) Aspergillus niger. B) Aspergillus itaconicus. C) Clostridium butylicum. D) Acetobacter. Show Answer Correct Answer: D) Acetobacter. 22. Trichoderma species are free living ..... that are very common in the root ecosystems. A) Algae. B) Bacteria. C) Virus. D) Fungi. Show Answer Correct Answer: D) Fungi. 23. Apids are controlled by A) Dragon fly. B) Lady bird beetle. C) Cyanobacteria. D) Baculoviruses. Show Answer Correct Answer: B) Lady bird beetle. 24. Identify the pair where both organisms are FUNGI: A) Rhizobium and Glomus. B) Trichoderma and Monascus. C) Anabaena and Aspergillus. D) Bacillus and Penicillium. Show Answer Correct Answer: B) Trichoderma and Monascus. 25. For the production of beverages and antibiotics on an industrial scale, microbes are grown in very large vessels called: A) Digestors. B) Aeration tanks. C) Fermentors. D) Settling tanks. Show Answer Correct Answer: C) Fermentors. 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