This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 10 Microbes In Human Welfare – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Baculoviruses (Nucleopolyhedrovirus) does not show A) Host specify. B) Narrow spectrum applications. C) Effects on non-target pathogens. D) Utility in IPM programme. Show Answer Correct Answer: C) Effects on non-target pathogens. 2. The solids which settle after primary treatment of sewage are called: A) Primary sludge. B) Activated sludge. C) Flocs. D) Total solids. Show Answer Correct Answer: A) Primary sludge. 3. Statement I:Penicillin was the first antibiotic to be discovered. Statement II:Its full potential as an effective antibiotic was established much later by Ernest Chain and Howard Florey. A) Both Statement I and Statement II are correct. B) Both Statement I and Statement II are incorrect. C) Statement I is correct, but Statement II is incorrect. D) None of the above. Show Answer Correct Answer: A) Both Statement I and Statement II are correct. 4. Which is currently tried for recycling of PET plastics A) Pseudomonas putida. B) Nitrosomonas europaea. C) Dehalococcoides. D) Ideonella sakaiensis. Show Answer Correct Answer: D) Ideonella sakaiensis. 5. Preliminary treatment A) Prevents toxic chemicals. B) Removes large objects. C) Is unnecessary. D) Is useless. Show Answer Correct Answer: B) Removes large objects. 6. The most common fungal partners of mycorrhiza are ..... species. A) Azotobacter. B) Glomus. C) Azolla. D) Frankia. Show Answer Correct Answer: B) Glomus. 7. What gases are produced in anaerobic sludge A) Machine and CO2 only. B) Methane, hydrogen sulphide and CO2. C) Methane, hydrogen sulphide and O2. D) Hydrogen sulphide and CO2. Show Answer Correct Answer: B) Methane, hydrogen sulphide and CO2. 8. The technology of biogas production in India has been developed by the efforts of:A. Khadi and Village Industries Commision (KVIC)B. Indian Council of Agricultural Research (ICAR)C. Indian Agricultural Research Institute (IARI)D. Indian Council of Medical Research (ICMR) A) A, C, D. B) C, D. C) A, C. D) A, B. Show Answer Correct Answer: C) A, C. 9. During the formation, bread becomes porous due to CO2 released by A) Protozoan. B) Bacteria. C) Yeast. D) Virus. Show Answer Correct Answer: C) Yeast. 10. BOD can be defined as A) Amount of CO2 consumed if all the inorganic matter in one litre of water is oxidized by bacteria. B) Amount of O2 consumed if all the organic matter in one decilitre of water is reduced by bacteria. C) Amount of O2 consumed if all the organic matter in one litre of water is oxidized by bacteria. D) Amount of O2 consumed if all the inorganic matter in one litre of water is oxidized by bacteria. Show Answer Correct Answer: C) Amount of O2 consumed if all the organic matter in one litre of water is oxidized by bacteria. 11. Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from:- A) Petroleum industry. B) Sugar industry. C) Domestic sewage. D) Dairy industry. Show Answer Correct Answer: A) Petroleum industry. 12. Which of the following is NOT a benefit of Mycorrhiza (Glomus) to the plant? A) Absorption of phosphorus. B) Resistance to root-borne pathogens. C) Tolerance to salinity and drought. D) Direct killing of insect pests. Show Answer Correct Answer: D) Direct killing of insect pests. 13. Identify the microbe used for the commercial production of Ethanol: A) Lactobacillus. B) Saccharomyces cerevisiae. C) Aspergillus niger. D) Clostridium butylicum. Show Answer Correct Answer: B) Saccharomyces cerevisiae. 14. Which one is produced from germinated Barley malt grain? A) Beer. B) Rum. C) Whisky. D) Red wine. Show Answer Correct Answer: A) Beer. 15. The bacteria commonly found in the, anaerobic sludge during sewage treatment: A) Streptococcus. B) Methanogens. C) Zymomonas mobilis. D) Thermoanaerobacter ethanolics. Show Answer Correct Answer: B) Methanogens. 16. Examples of antibiotics: A) Penicillin. B) Tetracyclines. C) Neomycin. D) All of the above. Show Answer Correct Answer: D) All of the above. 17. Bacillus thuringiensis is widely used as: A) Insecticide. B) Weedicides. C) Rodenticide. D) None of the above. Show Answer Correct Answer: A) Insecticide. 18. Treatment of waste water is done by the heterotrophic microbes naturally present in the sewage. This treatment is carried out in: A) One stage (Chemical only). B) Two stages (Physical and Biological). C) Three stages (Physical, Chemical, Biological). D) Two stages (Anaerobic only). Show Answer Correct Answer: C) Three stages (Physical, Chemical, Biological). 19. Apart from anaerobic sludge, Methanogens are also found in: A) The rumen of cattle. B) The stomach of humans. C) Aerated water. D) Root nodules. Show Answer Correct Answer: A) The rumen of cattle. 20. Trichoderma polysporum is used to produce A) Statins. B) Cyclosporin A. C) Lipases. D) Pectinases. Show Answer Correct Answer: B) Cyclosporin A. 21. Which of the following options includes biofertilizers? A) Cowdung manure and farmyard waste. B) A quick growing crop ploughed back into the field. C) Nostoc, Oscillatoria. D) All of these. Show Answer Correct Answer: C) Nostoc, Oscillatoria. 22. Which of the following bacteria convert milk into curd? A) Propionibacterium. B) Lactobacillus. C) Streptococcus. D) Bacillus. Show Answer Correct Answer: B) Lactobacillus. 23. Acetobacter aceti is the producer of Acetic acid. It belongs to which group of microbes? A) Fungi. B) Bacteria. C) Yeast. D) Virus. Show Answer Correct Answer: B) Bacteria. 24. Vinegar is prepared from alcohol with the help of A) Lactobacillus. B) Acrtobacter. C) Azotobacter. D) Rhizobium. Show Answer Correct Answer: B) Acrtobacter. 25. Agriculture by using only bio fertilizer is A) Manuring. B) Composting. C) Inorganic farming. D) Organic farming. Show Answer Correct Answer: D) Organic farming. ← 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 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