This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Biology Chapter 10 Microbes In Human Welfare – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 11 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Find out the examples of Biocontrol agents: A) Ladybird. B) Trichoderma. C) Bacillus thuringiensis. D) All of these. Show Answer Correct Answer: D) All of these. 2. Before antibiotics, the first commercial antibacterial available was ..... A) Penicillin. B) Prontosil. C) Azithromycin. D) None of the above. Show Answer Correct Answer: B) Prontosil. 3. The distillation of the fermented broth is required in the formation ofA. rumB. beerC. brandyD. whisky A) A, B, C. B) A, C, D. C) B, C, D. D) A, B, D. Show Answer Correct Answer: B) A, C, D. 4. In the anaerobic sludge digesters, bacteria digest the bacteria and fungi in the sludge. During this digestion, which gas is NOT produced? A) Methane. B) Hydrogen sulphide. C) Carbon dioxide. D) Methane. Show Answer Correct Answer: A) Methane. 5. Fungi are also known to form symbiotic associations with plants (mycorrhiza). Many members of the genus ..... form mycorrhiza. A) Trichoderma. B) Glomus. C) Aspergillus. D) Penicillium. Show Answer Correct Answer: B) Glomus. 6. Which is NOT a way in which bacteria are beneficial to humans? A) Aids in clean up of small oil spills. B) Is a source of disease. C) Aids in digestion in intestinal tracts. D) Is used in synthesizing drugs. Show Answer Correct Answer: B) Is a source of disease. 7. Which of the following food items is produced by fermentation by the microbes?A. IdliB. DosaC. ToddyD. Cheese A) A, B, C, D. B) C, D. C) A, C. D) A, B, C. Show Answer Correct Answer: A) A, B, C, D. 8. During which stage of sewage treatment microbes are used? A) Primary treatment. B) Secondary treatment. C) Tertiary treatment. D) All of these. Show Answer Correct Answer: B) Secondary treatment. 9. A patient brought to a hospital with myocardial infarction is normally immediately given: A) Penicillin. B) Streptokinase. C) Cyclosporin-A. D) Statins. Show Answer Correct Answer: B) Streptokinase. 10. Baculoviruses are pathogens that attack insects and other arthropods. The majority of baculoviruses used as biological control agents are in the genus: A) Nucleopolyhedrovirus. B) Retro polyhedrovirus. C) Adenovirus. D) Mosaic virus. Show Answer Correct Answer: A) Nucleopolyhedrovirus. 11. Penicillin's full potential as an effective antibiotic was established by: A) Alexander Fleming. B) Louis Pasteur. C) Ernest Chain and Howard Florey. D) Waksman. Show Answer Correct Answer: C) Ernest Chain and Howard Florey. 12. Besides converting milk to curd, LAB (Lactic Acid Bacteria) also play a beneficial role in: A) Fixing nitrogen in the stomach. B) Checking disease-causing microbes in the stomach. C) Producing ethanol in the stomach. D) Digesting cellulose in the appendix. Show Answer Correct Answer: B) Checking disease-causing microbes in the stomach. 13. Methanogens grow: A) Aerobically on protein material. B) Anaerobically on cellulosic material. C) Aerobically on cellulosic material. D) Anaerobically on protein material. Show Answer Correct Answer: B) Anaerobically on cellulosic material. 14. Assertion (A):The effluent from the primary settling tank is taken for secondary treatment.Reason (R):Secondary treatment is also known as biological treatment because it involves the use of microbes to consume organic matter. 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. 15. A biocontrol agent to be a part of an integrated pest management should be A) Species-specific and inactive on nontarget organisms. B) Species-specific and symbiotic. C) Free living and broad spectrum. D) Narrow spectrum and symbiotic. Show Answer Correct Answer: A) Species-specific and inactive on nontarget organisms. 16. Which of the following serve as biofertilizer in paddy fields? A) Bacteria. B) Yeast. C) Cyanobacteria. D) Fungi. Show Answer Correct Answer: C) Cyanobacteria. 17. The common nitrogen fixer in paddy fields is A) Rhizobium. B) Azospirillum. C) Oscillatoria. D) Frankia. Show Answer Correct Answer: C) Oscillatoria. 18. In sewage treatment, flocs are associated with: A) Primary treatment. B) Secondary treatment. C) Tertiary treatment. D) Sludge digestion. Show Answer Correct Answer: B) Secondary treatment. 19. Which gas is the main component of Biogas? A) Carbon dioxide. B) Methane. C) Hydrogen sulphide. D) Hydrogen. Show Answer Correct Answer: B) Methane. 20. High value of BOD indicates that A) Water is pure. B) Water is highly polluted. C) Water is less polluted. D) Consumption of organic matter in the water is higher by microbes. Show Answer Correct Answer: B) Water is highly polluted. 21. During the digestion of bacteria and fungi in the anaerobic sludge digesters, a mixture of gases is produced. These gases include: A) Methane, Hydrogen sulphide and Carbon dioxide. B) Methane, Hydrogen and Carbon dioxide. C) Methane, Oxygen and Hydrogen sulphide. D) Methane, Carbon monoxide and Nitrogen. Show Answer Correct Answer: A) Methane, Hydrogen sulphide and Carbon dioxide. 22. The compounds in food (fibers) that induce the growth or activity of beneficial microorganism are called A) Probiotics. B) Prebiotics. C) Single cell protein. D) Caesin. Show Answer Correct Answer: B) Prebiotics. 23. When was the Ganga Action Plan launched? A) Dec.1980. B) Jan 1993. C) Mar 1984. D) Jan 1986. Show Answer Correct Answer: D) Jan 1986. 24. Which one of the following is mainly produced by the activity of anaerobic bacteria on sewage? A) Laughing gas. B) Propane. C) Mustard gas. D) Marsh gas. Show Answer Correct Answer: D) Marsh gas. 25. Microbes are called, microbes because? A) You can hear them through a micro-scope. B) They are very minute. C) They can only be seen using a micro-scope,. D) Both 2 and 3. Show Answer Correct Answer: D) Both 2 and 3. ← 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 9Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books