This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 10 Microbes In Human Welfare – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A symbiotic relationship between fungal hyphae and roots of higher plants: A) Nostoc. B) Rhizobium. C) Mycorrhiza. D) Azotobacter. Show Answer Correct Answer: C) Mycorrhiza. 2. Which bacterium produces a 'clot buster' enzyme? A) Staphylococcus. B) Streptococcus. C) Salmonella. D) Saccharomyces. Show Answer Correct Answer: B) Streptococcus. 3. A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called A) Primary treatment. B) Activated sludge treatment. C) Cyclic treatment. D) Tertiary treatment. Show Answer Correct Answer: B) Activated sludge treatment. 4. Which is a symbiotic nitrogen fixing bacteria A) Tolypothrix. B) Anabena. C) Rhizobium. D) Nostoc. Show Answer Correct Answer: C) Rhizobium. 5. Secondary sewage treatment is A) Biological process. B) Chemical process. C) Mechanical process. D) Physical process. Show Answer Correct Answer: A) Biological process. 6. Assertion (A):Chemical pesticides are more hazardous as compared to biopesticidesReason(R):Chemical pesticides are mostly non specific, hazardous and pollute the atmosphere. 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: A) Both A and R are true and R is the correct explanation of A. 7. Methanogenic bacteria are not found in: A) Rumen of cattle. B) Gobar gas plant. C) Bottom of waterlogged paddy fields. D) Activated sludge. Show Answer Correct Answer: D) Activated sludge. 8. Which of the following is used as a substrate for alcohol fermentation? A) Maize. B) Barley. C) Sucrose. D) None of the above. Show Answer Correct Answer: C) Sucrose. 9. The Ministry of Environment and Forests has initiated which plans to save major rivers from pollution? A) Ganga Action Plan and Narmada Action Plan. B) Yamuna Action Plan and Kaveri Action Plan. C) Ganga Action Plan and Yamuna Action Plan. D) Clean River Mission. Show Answer Correct Answer: C) Ganga Action Plan and Yamuna Action Plan. 10. Waste water treatment generates a large quantity of sludge, which can be treated by: A) Floc. B) Chemicals. C) Oxidation pond. D) Anaerobic digesters. Show Answer Correct Answer: D) Anaerobic digesters. 11. Which one of the following sets includes bacterial diseases? A) Tetanus, tuberculosis, measles. B) Diphtheria, leprosy, plague. C) Cholera, typhoid, mumps. D) Malaria, mumps, poliomyelitis. Show Answer Correct Answer: B) Diphtheria, leprosy, plague. 12. Cyanobacteria are autotrophic microbes. Many of them can fix atmospheric nitrogen, e.g.: A) Anabaena, Nostoc, Oscillatoria. B) Rhizobium, Azotobacter, Anabaena. C) Glomus, Trichoderma, Nostoc. D) Azospirillum, Oscillatoria, Glomus. Show Answer Correct Answer: A) Anabaena, Nostoc, Oscillatoria. 13. Assertion (A):The greater the BOD of waste water, the more is its polluting potential.Reason (R):BOD refers to the amount of oxygen that would be consumed if all the inorganic matter in one liter of water were oxidized by bacteria. 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 the correct explanation of A. C) A is true but R is false. D) A is false but R is true. Show Answer Correct Answer: A) Both A and R are true and R is the correct explanation of A. 14. Which one of the following is false with regard to mycorrhiza A) Provide tolerance to salinity and drought. B) Give resistance to root-borne pathogens. C) Perform nitrogen fixation. D) Help in an overall increase in plant growth and development. Show Answer Correct Answer: C) Perform nitrogen fixation. 15. Which of the following is not used in organic farming A) Earthworm. B) Oscillatoria. C) Snail. D) Glomus. Show Answer Correct Answer: C) Snail. 16. Elaborate the following:VAM A) Vesicle-amber mycorrhiza. B) Vesicular-ambuscular mycorrhiza. C) Vesicular-arbuscular mycorrhiza. D) None of these. Show Answer Correct Answer: C) Vesicular-arbuscular mycorrhiza. 17. Assertion (A):Besides curdling of milk, LAB also improves its nutritional quality by increasing vitamin B12Reason(R):LAB, when present in human stomach, check disease causing microbes 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. 18. The bacteria found in the root nodules of leguminous plants: A) Anabaena. B) Azospirillum lipoferum. C) Azotobacter. D) Rhizobium. Show Answer Correct Answer: D) Rhizobium. 19. Statins produced by the yeast Monascus purpureus have been commercialised as: A) Blood clotting agents. B) Blood cholesterol lowering agents. C) Immunosuppressive agents. D) Clot busters. Show Answer Correct Answer: B) Blood cholesterol lowering agents. 20. Which of the following serve as biofertilizers in paddy fields? A) Bacteria. B) Yeast. C) Cyanobacteria. (blue-green algae). D) Fungi. Show Answer Correct Answer: C) Cyanobacteria. (blue-green algae). 21. Example for an anaerobic fungus A) Phanerochaete chrysosporium. B) Pestalotiopsis microspora. C) Dechloromonas aromatica. D) Dehalococcoids. Show Answer Correct Answer: A) Phanerochaete chrysosporium. 22. Which role is played by lactic acid bacteria (LAB) in our stomach? A) Beneficial. B) Harmful. C) Neutral. D) All of these. Show Answer Correct Answer: A) Beneficial. 23. Which enzymes are used in detergent formulations and are helpful in removing oily stains from the laundry? A) Pectinases. B) Proteases. C) Lipases. D) Amylases. Show Answer Correct Answer: C) Lipases. 24. Microbes are diverse which include A. BacteriaB. MossesC. ProtozoansD. Fungi A) A, C, D. B) A, D. C) A, B. D) C, D. Show Answer Correct Answer: A) A, C, D. 25. Curd is considered more nutritious than milk because it contains increased quality of: A) Vitamin B12. B) Vitamin C. C) Vitamin A. D) Vitamin E. Show Answer Correct Answer: A) Vitamin B12. ← 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 8Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 9Class 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