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Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 3 (60 MCQs)

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1. The same yeast, Saccharomyces cerevisiae, is used for bread-making and beverage production. In the context of beverages, it is commonly called:
2. Which of these is an example of an antibiotic?
3. Large holes in Swiss cheese are due to:
4. A good producer of citric acid is (a) Clostridium (b) Saccharomyces (c) Aspergillus (d) Pseudomonas
5. Cyclosporin A is used as an immunosuppressive agent in organ-transplant patients. It is produced by:
6. Roquefort cheese is ripened by growing a specific ..... on them, which gives them a particular flavour.
7. Monarchs purpureus is a yeast used commercially in the production of
8. The technology of biogas production was developed in India mainly due to the efforts of:
9. Biofertilizers are ..... that enrich the nutrient quality of the soil.
10. Large holes in Swiss cheese are formed due to production of a large amount of CO$_{2}$ by
11. The use of chemical fertilizers to meet the ever-increasing demand of agricultural produce has contributed significantly to:
12. The word "antibiotic" means
13. The bio-active molecule cyclosporin A is used in-
14. The enzyme that converts glucose into alcohol, is
15. Biogas contains-
16. Monascus purpureus is a yeast used commercially in the production of
17. Antibiotics are chemical substances that kill bacterial cells by interrupting a key cellular function
18. A beetle with red and black markings, known as the Ladybird, is useful in controlling:
19. According to the organic farmer, the eradication of the creatures that are often described as pests is:
20. A key belief of the organic farmer regarding biodiversity is:
21. Blue green algae (Cyanobacteria) also add ..... to the soil and increase its fertility.
22. Which of the following is produced by a microbe but is NOT an enzyme?
23. Selman Waksman used the term antibiotic in
24. The nutritive media for growing bacteria and other microorganisms in the laboratory is called-
25. Penicillin is an example of a painkiller
26. A symbiotic relationship between fungal hyphae and roots of higher plants:
27. Which bacterium produces a 'clot buster' enzyme?
28. 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
29. Which is a symbiotic nitrogen fixing bacteria
30. Secondary sewage treatment is
31. Assertion (A):Chemical pesticides are more hazardous as compared to biopesticidesReason(R):Chemical pesticides are mostly non specific, hazardous and pollute the atmosphere.
32. Methanogenic bacteria are not found in:
33. Which of the following is used as a substrate for alcohol fermentation?
34. The Ministry of Environment and Forests has initiated which plans to save major rivers from pollution?
35. Waste water treatment generates a large quantity of sludge, which can be treated by:
36. Which one of the following sets includes bacterial diseases?
37. Cyanobacteria are autotrophic microbes. Many of them can fix atmospheric nitrogen, e.g.:
38. 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.
39. Which one of the following is false with regard to mycorrhiza
40. Elaborate the following:VAM
41. 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
42. The bacteria found in the root nodules of leguminous plants:
43. Statins produced by the yeast Monascus purpureus have been commercialised as:
44. Which of the following serve as biofertilizers in paddy fields?
45. Example for an anaerobic fungus
46. Which role is played by lactic acid bacteria (LAB) in our stomach?
47. Which enzymes are used in detergent formulations and are helpful in removing oily stains from the laundry?
48. Microbes are diverse which include A. BacteriaB. MossesC. ProtozoansD. Fungi
49. Curd is considered more nutritious than milk because it contains increased quality of:
50. Baculoviruses (Nucleopolyhedrovirus) does not show
51. The solids which settle after primary treatment of sewage are called:
52. 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.
53. Which is currently tried for recycling of PET plastics
54. Preliminary treatment
55. The most common fungal partners of mycorrhiza are ..... species.
56. What gases are produced in anaerobic sludge
57. 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)
58. During the formation, bread becomes porous due to CO2 released by
59. BOD can be defined as
60. Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from:-
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