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Class 12 Biology Chapter 10 Microbes In Human Welfare Quiz 2 (60 MCQs)

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1. Which characteristic makes Nucleopolyhedrovirus an excellent candidate for Integrated Pest Management (IPM)?
2. In anaerobic sludge digesters, the anaerobic bacteria
3. After the clarification step in wastewater treatment, the solid waste called ..... is sold off and the liquid waste called ..... moves on the be filtered and disinfected
4. Agriculture by using only biofertilizers is called
5. Which of the following is a commercial blood cholesterol lowering agent?
6. An organism used as a biofertiliser for soyabean crop is
7. Types of alcoholic beverages obtained depend on-
8. A good producer of citric acid is
9. What is the role of bacteria present in the rumen of cattle?
10. The gases that evolve from anaerobic sludge digester constitute .....
11. Microbes are present everywhere. Which of the following is an environment where microbes can exist?
12. Which of the following is a symbiotic nitrogen fixer?
13. ..... are free living bacteria which fix atmospheric nitrogen in soil.
14. The microscopic proteinaceous infectious agents are called-
15. Which of the following microbes can be seen with the naked eye when grown on nutritive media?
16. Streptokinase, used as a 'clot buster' for removing clots from blood vessels of patients who have undergone myocardial infarction, is produced by:
17. Rennin employed in cheese production is a /an
18. Cyclosporin A is produced from-
19. The dough used for making bread is fermented using:
20. The puffed-up appearance of dough used for making dosa and idli is due to the production of:
21. Which of the following is not produced with distillation
22. Which of the following is NOT a benefit provided by Glomus to the plant?
23. Which of the following is a non-symbiotic biofertiliser?
24. Baculoviruses (Nucleopolyhedrovirus) are excellent candidates for:
25. Which of the following alcoholic beverages are produced without distillation of the fermented broth?
26. The symbiotic bacteria Rhizobium fix atmospheric nitrogen into ..... in legume plants.
27. The examples of free-living soil bacteria which can fix atmospheric nitrogen into organic form are
28. Dragonflies are useful to get rid of .....
29. The bioactive molecule Cyclosporin A is used as:
30. Which of the following in sewage treatment removes suspended solids?
31. Which one(s) is/are correct about Cyclosporin A?
32. Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?
33. The gas responsible for puffing-up appearance of dough comes from:
34. The bacteria Bacillus thuringiensis (Bt) are used to control:
35. The amount of oxygen required by the microbes in the decomposition of organic matter is called-
36. Streptokinase, a clot buster used to remove clots from blood vessels of patients of myocardial infraction is obtained from
37. Azolla pinnata has been found to be an important biofertiliser for paddy crops. This quality is due to the presence of
38. Statement I:The activated sludge is pumped into large tanks called anaerobic sludge digesters. Statement II:In these tanks, other kinds of bacteria, which grow anaerobically, digest the bacteria and fungi in the sludge.
39. The dough used for making bread is fermented by
40. A small part of the activated sludge is pumped back into the aeration tank to serve as:
41. Assertion (A):Leguminous plants are best preferred in rotation of cropsReason(R):They have root nodules which have nitrogen fixing bacteria Clostridium.
42. A typical biogas plant consists of a concrete tank in which bio-wastes are collected and a slurry of dung is fed. A ..... is placed over the slurry.
43. A common nitrogen fixer in common fields is
44. Yeasts have been used for the commercial production of A. wineB. whiskyC. ethanolD. curd
45. Certain bacteria, which grow anaerobically on cellulosic material, produce large amounts of methane along with CO ..... 2 and H ..... 2. These bacteria are collectively called:
46. Trichoderma species are free-living fungi that are very common in:
47. Acetic acid is produced by a:
48. The primary treatment of sewage involves-
49. Process used in water treatment process where water is pushed through screens, sand, gravel and coal to remove organisms and trash
50. Statins used for lowering blood-cholesterol level are extracted from:
51. During secondary treatment, vigorous growth of useful aerobic microbes into 'flocs' occurs. What are 'flocs'?
52. Microbes like bacteria and many fungi can be grown on nutritive media to form colonies. These colonies are useful because:
53. In Gobart gas the maximum amount is that of
54. Select the correct statement from the following
55. Which of the following bacteria has a role in removing clots from our blood vessels?
56. What happens in the digesters?
57. Lactic Acid Bacteria (LAB) improve the nutritional quality of curd by increasing the amount of:
58. Which of the following serves as an important biofertilizer in paddy fields?
59. Which bacteria form symbiotic association with the nodules on the roots of leguminous plants to fix atmospheric nitrogen?
60. Identify the function of statin
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