MICROBES IN HUMAN WELFARE

1. By the action of ………, during the formation of bread it becomes porous due to release of CO2. (1) Yeast (2) Bacteria (3) Virus (4) Protozoans 2. Which one of the following is left undergraded during anaerobic digestion of organic waste, such as in producing biogas? (1) Lipids (2) Lignin (3) Hemi-cellulose (4) Cellulose 3. Who coined the term "antibiotic”? (1) Edward Jenner (2) Louis Pasteur (3) Selman Waksman (4) Alexander Fleming 4. What is the amount of alcohol permitted for mixing in petrol by Govt of India? (1) 5% (2) 2.5% (3) 10-15% (4) 10% 5. Which one is a free living nitrogen-fixing cyanobacteria which can also form symbiotic association with the water fern Azolla ? (1) Anabaena (2) Tolypothrix (3) Chlorella (4) Rhizobium 6. Mainly due to the efforts of …………the technology of biogas production was developed in India (1) IARI (2) KVIC (3) both (1) and (2) (4) WHO 7. ……………. is present in Biogas produced by anaerobic fermentation of waste biomass . (1) methane (2) traces of H2, H2S and N2 (3) CO2 (4) all of these 8. Among the following which one of is used in the making of bread? (1) Rhizopus stolonifera (2) Saccharomyces cerevisiae (3) Zygasaccharomyces (4) Saccharomyces ludwigi 9. From ………….the drug Cyclosporin used for organ transplant patients is obtained. (1) Bacterium (2) Fungus (3) Virus (4) Plant 10. Name the biocontrol agent for the control of plant diseases caused by fungi. (1) Agrobacterium (2) Glomus (3) Trichoderma (4) Baculovirus 11. Choose the microbes that forms symbiotic association with plants and helps them in their nutrition ? (1) Glomus (2) Trichoderma (3) Azotobacter (4) Aspergillus 12. Lactic acid bacteria (LAB) grow in milk and convert it to curd and also improve its nutritional quality by increasing :- (1) Vitamin A (2) Vitamin B12 (3) Vitamin B6 (4) Vitamin C and A 13. Due to……..The dough shows puffed-up appearance . (1) Growth of LAB (2) Production of O2& ethanol (3) Production of CO2 (4) Growth of yeast Monascus 14. Among the following……… fermented baverage will not be produced by distillation of fermented broth. (1) Whisky (2) Brandy (3) Rum (4) Wine 15. Choose the correct match - (1) Aspergillus niger - Acetic acid (2) Streptokinase – Immunosuppressive (3) Cyclosporin - A - Clot buster (4) Statins - Cholesterol lowering agent 16. The type of the gas produced in biogas by the microbial activitydepends upon– (1) type of microbes (2) type of organic substrate / waste (3) size of digester (4) 1 & 2 both 17. Select the biocontrol agent is very common in root ecosystem & is effective against several plant pathogens. (1) Baculoviruses (2) Trichoderma (3) Nucleopolyhedro virus (4) Ladybird beetle & Dragonflies 18. Among the following which bacterium is associated with production of bioinsecticide ? (1) Bacillus subtilis (2) Bacillus thuringensis (3) Agrobacterium (4) Azotobactor 19. Bio pesticide include :- (1) Only bioinsecticide (2) Only bioherbicide (3) Bioinsecticide & bioherbicide (4) Bioherbicide, bioinsecticide & biofertilisers 20. To control ………Bacillus thuringiensis is used:- (1) Moth (2) Flies (3) Mosquito (4) All the above 21. For……………………….Trichoderma has proved a useful microorganism. (1) Gene transfer in higher plants (2) Biological control of soil-borne plant pathogens (3) Bioremediation of contaminated soils (4) reclamation of wastelands 22. Which among the following is a microbial insecticide ? (1) Bacillus polymixa (2) Bacillus brevis (3) Bacillus subtilio (4) Bacillus thuringenesis 23. To get rid of…………. Laybird is useful (1) Aphids (2) mosquioes (3) Boll worm (4) Jassids 24.In India which one of the following is being tried as a biofuel substitute for fossil fuels ? (1) Jatropha (2) Musa (3) Aegilops (4) Azadirachta 25. Find out the one which is a wrong matching of a microbe and its industrial product, from the below options. (1) Aspergillus niger - citric acid (2) Yeast – Statins (3) Acetobacter aceti - acetic acid (4) Clostridium butylicum - lactic acid 26. Read the following statement having two blanks (A and B) : "A drug used for ____(A)___ patients is obtained from a species of the organism ____(B)____ ."The one correct option for the two blanks is : Blank - A Blank – B (1) AIDS Pseudomonas (2) Heart Penicillium (3) Organ-transplant Trichoderma (4) Swine flu Monascus 27. In the production of …………Yeast is used. (1) Bread and beer (2) Cheese and butter (3) Citric acid and lactic acid (4) Lipase and pectinase 28. Normally ……….is given immediately when a patient brought to a hospital with myocardial infarction. (1) Cyclosporin-A (2) Statins (3) Penicillin (4) Streptokinase 29. Select the best example of carrying out biological control of pests/diseases using microbes? (1) Bt-Cotton to increase cotton yield (2) Lady bird beetle against aphids in mustard (3) Trichoderma sp. against certain plant pathogens. (4) Nucleopolyhedrovirus against white rust in Brassica 30. The category of prokaryotes those are helpful to humans in making curd from milk and in production of antibiotics . (1) Chemosynthetic autotrophs (2) Heterotrophic bacteria (3) Cyanobacteria (4) Archaebacteria 31. In the commercial production of………. yeastMonascus purpureus is a used. (1) citric acid (2) blood chlolesterol lowering statins (3) ethanol (4) streptokinase for removing clots from the blood vessels. 32., The maximum amount in gobar gas is:- (1) Propane (2) Carbon dioxide (3) Butane (4) Methane 33. Select the option which includes all the correct ones only from the following four statements (a-d) and (a) Single cell Spirulina can produce large quantities of food rich in protein, minerals, vitamins etc. (b) Body weight-wise the microorganism Methylophilus methylotrophus may be able to produce several times more proteins than the cows per day. (c) Common button mushrooms are a very rich source of vitamin C. (d) A rice variety has been developed which is very rich in calcium. Options (1) Statements (b) , (c) and (d) (2) Statements (a) , (b) (3) Statements (c) , (d) (4) Statements (a) , (c) and (d) 34. Select the goodcitric acid producer: (1) Saccharomyces (2) Aspergillus (3) Pseudomonas (4) Clostridium 35. Biogases are produced during sewage treatment, which include : (1) hydrogensulphide, nitrogen, methane (2) methane, hydrogensulphide, carbon dioxide (3) methane, oxygen, hydrogensulphide (4) hydrogensulphide, methane, sulphur dioxide 36. Select the correct regarding microbes in human welfare . (1) Saccharomyces cereviceae is useful in industries for production of citric acid (2) Trichoderma polysporum is used as blood cholesterol lowering agent (3) Aspergillus niger used to obtain acetic acid (4) In sewage treatment CO2, H2 and CH4 gases are produced from activated sludge by bacteria such as Methanobacterium 37. From the following statements choose the correct one. (1) Aspergillus niger is bacterium which is used for obtaining acetic acid & citric acid (2) Streptokinase is used as a clot buster (3) Monascus purpureus is responsible for production of large holes in Swiss cheese (4) Toddy is manufactured by Lactobacillus 38. Match the following list of microbes and their importance
Column I Column II
A Saccharomyces Cerevisiae i Production of immunosuppressive agent
B Monascus purpureus ii Ripening of swiss cheese
C Trichoderma polysporum iii Commercial production of ethanol
D Propionibacterium Sharmanii iv Production of blood-cholesterol lowering agent
(a)(b) (c) (d) (1) (iii) (i) (iv) (ii) (2) (iii) (iv) (i) (ii) (3) (iv) (iii) (ii) (i) (4) (iv) (ii) (i) (iii) 39. make the correct match of column A and B.
Options :- (1) A - i, B - ii, C - iii, D – iv (2) A - ii, B - i, C - iv, D – iii (3) A - ii, B - i, C - iii, D – iv (4) A - iii, B - iv, C - i, D – ii 40. In the given table,which of the following is wrongly matched?
Microbe Product Applicatioon
1 Trichoderma polysporum Cyclosporin A immunosuppressive drug
2 Monascus purpureus Statins lowering of blood cholesterol
3 Steptococus Steptokinase removal of clot from blood vessel
4 Clostridium acetobutyliam Lipase removal of oil stains
41. About antibiotics which statement is not true– (1) First anitobiotic was discovered by Alexander Fleming (2) The term ’antibiotic’ was coined by S. Waksman in 1942. (3) Some persons can be allergic to a particular antibiotic (4) Each antibiotic is effective only against one particular kind of germ. 42. In the industrial production of citric acid Which microorganism is used. (1) Lactobacillus bulgaricus (2) Penicillium citrinum (3) Aspergillus niger (4) Rhizopus nigricans 43. Microorganism which helps in the formation of vinegar from alcohol is …. (1) Bacillus subtilis (2) Clostridium (3) Acetobacter aceti (4) Azotobacter 44. Contents of biogas (1) Carbon monooxide, methane and hydrogen (2) Carbon dioxide, methane and hydrogen (3) Carbon monooxide, ethane and hydrogen (4) Carbon dioxide, ethane and hydrogen 45. In the production of ’Fuel alcohol’ the pioneer country is (1) Japan (2) Brazil (3) Saudi Arabia (4) India 46. Most of the petrocrops belong to family (1) Leguminoase (2) Euphorbiaseae (3) Rutaceae (4) Malvaceae 47. Biogas production is a (1) One step process (2) Two-step process (3) Three step process (4) Multistep process 48. From ………Beer is obtained (1) Molasses (2) Grapes (3) Barley (4) Rye 49. Alcohol percentage is maximum in ………….. product of yeast fermentation: (1) Brandy (2) Gin (3) Rum (4) Wine 50. For Swiss cheese which of the following Microorganism is used (1) Propionibacterium (2) Geotrichum (3) Penicillium (4) Streptococcus 51. Rate limiting material in biogas production is: (1) Methane (2) Cellulose (3) Starch (4) Acetic acid 52. Which group is not related with Petroplantation: (1) Euphorbiaceae (2) Asclepiadiaceae (3) Apocyanaceae (4) Leguminaceae 53. Over convential utilization what are the advantage of gobar gas (1) More efficient source of energy (2) Used as good fertilizer (3) Reduces the chances of spreading of pathogens (4) All the above 54. Curd is formed from milk by – (1) Bacillus Megatherium (2) Acetobactor aceti (3) Xanthomonas citri (4) Lactobacillus acidophilus 55. In the formation of ……………Saccharomyces cerevissae is used:- (1) Ethanol (2) Methanol (3) Acetic acid (4) Antibiotics 56. By the use of……….. modern farmer’s can increase the yield of Paddy upto 50%. (1) Cyanobacteria (2) Rhizobium (3) Mycorrhiza (4) Farm yard manure 57. ………….. gas is produce by decomposing the gobar in to gobar gas:- (1) Fungus (2) Virus (3) Methanogenic bacteria (4) Algae 58. To manufacture ethanol from starch……………is used:- (1) Penicillium (2) Saccharomyces (3) Azotobactor (4) Lactobacillus 59. Choose the pair of biofertilizer (1) Azolla and BGA (2) Nostoc and legume (3) Rhizobium and grasses (4) Salmonella & E. Coli 60. The bacterium which isused in Gober gas plant :- (1) Methanogens (2) Nitrifying bacteria (3) Ammonifying bacteria (4) Denitrifying bacteria 61. ………. are the primitive prokaryotes which are responsible for the production of biogas from the dung of ruminant animals. (1) Halophiles (2) Thermoacidiophiles (3) Methanogens (4) Eubacteria 62. Match Column–I with Column–II and select the correct option using the codes given below
Codes : abcd (1)i iv ii iii (2) iii iv i ii (3) iii i ii iv (4) iii i iv ii 63. Mention the cyclosporin-A source:- (1) Acetobacter aceti (2) Saccharomyces cerevisiae (3) Aspergillus niger (4) Trichoderma polysporum 64. Blood cholesterol lowering agents- Statins,which are commercially used, are produced by :- (1) Agrobacterium tumefaciens (2) Trichoderma polysporum (3) Monascus purpureus (4) Trichoderma viridae 65. For plant pathogen which of the following is a free living biocontrol microbial agent . (1) Mucor (2) Glomus (3) Trichoderma (4) Rhizobium 66. Biological control agent obtained from :- (1) Bacillus thuringiensis (2) E.coli (3) Agrobacterium tumifaciens (4) Meloidogyne incognitia 67. Select the correct match for the product produced by them ? (1) Methanobacterium : Lactic acid (2) Penicillium notatum : Acetic acid (3) Sacchromyces cerevisiae : Ethanol (4) Acetobacter aceti : Antibiotics 68. Conversion of milk to curd increases the amount of (1) Vitamin D (2) Vitamin A (3) Vitamin B12 (4) Vitamin E 69. From…………..Penicillin is obtained: (1) Yeast (2) Bacteria (3) Fungi (4) Algae 70. Match the following:-
(1) (i) -c , (ii) - a,(iii) -d ,(iv) – b (2) (i) -c , (ii) -d ,(iii) -a ,(iv) - b (3) (i) -a , (ii) - b,(iii) -c ,(iv) - d (4) (i) -a , (ii) -b ,(iii) -d ,(iv) - c 71.Select the correct statement from the following. (1) Cyanobacteria form mycorhhiza which helps in absorption of phosphate (2) Methanobacterium digest cellulose in anaerobic conditions (3) Azotobacter fix nitrogen symbiotically (4) Rhizobium can fix nitrogen both free living and Symbiotically 72. Assertion :- Statins are used as blood cholesterol lowering agent. Reason :- It obtained from Monascus purpureus and acts by competitively inhibiting the enzyme responsible for synthesis of cholesterol. (1) A (2) B (3) C (4) D 73. Assertion :- Saccharomyces cerevisae is used for bread making and in brewing industry. Reason :- Saccharomyces cerevisae is a unicellular fungi. (1) A (2) B (3) C (4) D 74. Assertion :- Trichoderma is a biocontrol agent of several plant pathogens. Reason :- Nucleopolyhedrovirus are good biocontrol agents for insects. (1) A (2) B (3) C (4) D 75. Assertion :- NPV are good biocontrol agents for specific organisms. Reason :- CaMV35Sis a constitutive promoter. (CaMV35S = Cauliflower Mosaic Virus 35S) (1) A (2) B (3) C (4) D 76. Assertion :- Bt-cotton is a genetically modified crop. Reason :- It releases insecticidal protein to kill adult butterfly. (1) A (2) B (3) C (4) D 77. Assertion :- Trichoderma polysporum is an important fungus. Reason :- Cyclosporin-A is obtained from this fungus which is used as an immunosuppressive agent in organ transplant. (1) A (2) B (3) C (4) D 78. Assertion :- Crop production without use of chemical fertilizers is called organic farming. Reason :- Cyanobacteria are autotrophic prokaryotes which are used as biofertilizers in paddy fields. (1) A (2) B (3) C (4) D 79. Assertion :- The full potential of penecillin as an antibiotic was established by Alexander Flemming. Reason :- His very first observation was that no bacteria were growing near the culture of Penicillium notatum that he was preparing in lab. (1) A (2) B (3) C (4) D 80. Assertion :- Bacillus thuringiensis is also used in making curd. Reason :- Bacillus thuringienis is the group of bacteria which converts the lactose into lactic acid. (1) A (2) B (3) C (4) D 81. Assertion :- Organic farming is very benefical for farmers to increase crop production. Reason :- Bacteria, fungi, mycorrhiza, cyanobacteria are better biofertilizer which fix nitrogen and increase soil fertility. (1) A (2) B (3) C (4) D 82. Assertion :- Azolla is used as biofertilizer in paddy fields. Reason :- BGA is found in the leaves of Azolla. (1) A (2) B (3) C (4) D 83. Assertion :- Mycorrhizal association is useful for plants. Reason :- All fungi do not show mycorrhizal association. (1) A (2) B (3) C (4) D Answer key
1 1 21 2 41 4 61 3 81 1
2 2 22 4 42 3 62 4 82 1
3 3 23 1 43 3 63 4 83 2
4 1 24 1 44 2 64 3
5 1 25 4 45 2 65 3
6 3 26 3 46 2 66 1
7 4 27 1 47 3 67 3
8 2 28 4 48 3 68 3
9 2 29 3 49 1 69 3
10 3 30 2 50 1 70 1
11 1 31 2 51 2 71 2
12 2 32 4 52 4 72 1
13 3 33 2 53 4 73 2
14 4 34 2 54 4 74 2
15 4 35 2 55 1 75 2
16 4 36 4 56 1 76 3
17 2 37 2 57 3 77 1
18 2 38 2 58 2 78 2
19 3 39 1 59 1 79 1
20 4 40 4 60 1 80 4
Previous year NEET questions 1. Which of the following in sewage treatment removes suspended solids? [2017] (a) Secondary treatment (b) Primary treatment (c) Sludge treatment (d) Tertiary treatment 2. Which of the following is correctly matched for the product produced by them ? [2017] (a) Methanobacterium : Lactic acid (b) Penicillium notatum : Acetic acid (c) Sacchromyces cerevisiae : Ethanol (d) Acetobacter aceti : Antibiotics 3. The guts of cow and buffalo possess [2015 RS] (a) Chlorella spp. (b) Methanogens (c) Cyanobacteria (d) Fucus spp. 4. What gases are produced in anaerobic sludge digesters? [2014] (a) Methane and CO2 only (b) Methane, Hydrogen Sulphide and CO2 (c) Methane, Hydrogen Sulphide and O2 (d) Hydrogen Sulphide and CO2 5. During sewage treatment, biogases are produced which include : [NEET 2013] (a) methane, oxygen, hydrogen sulphide (b) hydrogen sulphide, methane, sulphur dioxide (c) hydrogen sulphide, nitrogen, methane (d) methane, hydrogen sulphide, carbon dioxide 6. A good producer of citric acid is : [NEET 2013] (a) Pseudomonas (b) Clostridium (c) Saccharomyces (d) Aspergillus 7. Monascus purpureus is a yeast used commercially in the production of : [2012] (a) ethanol (b) streptokinase for removing clots from the blood vessels. (c) citric acid (d) blood cholesterol lowering statins 8. A patient brought to a hospital with myocardial infarction is normally immediately given :[2012] (a) Penicillin (b) Streptokinase (c) Cyclosporin-A (d) Statins 9. Yeast is used in the production of [2012] (a) Citric acid and lactic acid (b) Lipase and pectinase (c) Bread and beer (d) Cheese and butter 10. Which one of the following is an example of carrying out biological control of pests diseases using microbes ? [2012] (a) Trichoderma sp. against certain plant pathogens (b) Nucleopolyhedrovirus against white rust in Brassica (c) Bt - cotton to increase cotton yield (d) Lady bird beetle against aphids in mustard 11. The domestic sewage in large cities [2012M] (a) has a high BOD as it contains both aerobic and anaerobic bacteria. (b) is processed by aerobic and then anaerobic bacteria in the secondary treatment in Sewage Treatment Plants (STPs). (c) when treated in STPs does not really require the aeration step as the sewage contains adequate oxygen. (d) has very high amounts of suspended solids and dissolved salts. 12. Read the following statement having two blanks (A and B): “A drug used for -------- (A) -------- patients is obtained from a species of the organism -------- (B) --------.” The one correct option for the two blanks is [2011M] Blank - A Blank - B (a) Heart Penicillium (b) Organ-transplant Trichoderma (c) Swine flu Monascus (d) AIDS Pseudomonas 13. Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct ? [2011M] (a) Yeast - statins (b) Acetobacter aceti - acid (c) Clostridium butylicum - lactic acid (d) Aspergillus niger - citric acid 14. Ethanol is commercially produced through a particular species of : [2011] (a) Saccharomyces (b) Clostridium (c) Trichoderma (d) Aspergillus 15. Which one of the following pairs is wrongly matched? [2009] (a) Alcohol - nitrogenase (b) Fruit juice - pectinase (c) Textile - amylase (d) Detergents - lipase 16. Trichoderma harzianum has proved a useful microorganism for [2008] (a) bioremediation of contaminated soils (b) reclamation of wastelands (c) gene transfer in higher plants (d) biological control of soil-borne plant pathogens 17. Modern detergents contain enzyme preparations of: [2008] (a) Acidophiles (b) Alkaliphiles (c) Thermoacidophiles (d) Thermophiles 18. Human insulin is being commercially produced from a transgenic species of [2008] (a) Escherichia (b) Mycobacterium (c) Rhizobium (d) Saccharomyces 19. Probiotics are [2007] (a) cancer inducing microbes (b) new kind of food allergens (c) live microbial food supplement (d) safe antibiotics 20. Which one of the following pairs is wrongly matched ? [2007] (a) Yeast - ethanol (b) Streptomycetes - antibiotic (c) Coliforms - vinegar (d) Methanogens - gobar gas. 21. Which one of the following pairs is not correctly matched? [2004] (a) Streptomyces - Antibiotic (b) Serratia - Drug addiction (c) Spirulina - Single cell protein (d) Rhizobium - Biofertilizer 22. Dough kept overnight in warm weather becomes soft and spongy because of [2004] (a) absorption of carbon dioxide from atmosphehre (b) fermentation (c) cohesion (d) osmosis 23. The term antibiotic was first used by [2003] (a) Flemming (b) Pasteur (c) Waksman (d) Lister 24. During the formation of bread it becomes porous due to release of CO2 by the action of (a) Yeast (b) Bacteria [2002] (c) Virus (d) Protozoans 25. Industrial production of ethanol from starch is brought about by [2000] (a) Saccharomyces (b) Lactobacillus (c) Azotobacter (d) Penicillium 26. Which one of the following micro-organisms is used for production of citric acid in industries? [1998] (a) Penicillium citrinum (b) Aspergillus niger (c) Rhizopus nigricans (d) Lactobacillus bulgaris 27. Yeast Saccharomyces cerevisiae is used in the industrial production of [1998] (a) citric acid (b) tetracycline (c) ethanol (d) butanol 28. Which one thing is not true about antibiotics?[1996] (a) The term “antibiotic” was coined by Selman Waksman in 1942 (b) First antibiotic was discovered by Alexander Flemming (c) Each antibiotic is effective only against one particular kind of germ (d) Some persons can be allergic to a particular antibiotic 29. The organism, used for alcoholic fermentation, is [1995] (a) Pseudomonas (b) Penicillium (c) Aspergillus (d) Saccharomyces 30. Which of the following is wrongly matched in the given table ? [2016]
Microbe Product Applicatioon
a Trichoderma polysporum Cyclosporin A immunosuppressive drug
b Monascus purpureus Statins lowering of blood cholesterol
c Steptococus Steptokinase removal of clot from blood vessel
d Clostridium acetobutyliam Lipase removal of oil stains
31. The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the [2016] (a) Halophiles (b) Thermoacidiophiles (c) Methanogens (d) Eubacteria 32. Match the following list of microbes and their importance: [2015 RS]
Column I Column II
A Saccharomyces Cerevisiae i Production of immunosuppressive agent
B Monascus purpureus ii Ripening of swiss cheese
C Trichoderma polysporum iii Commercial production of ethanol
D Propionibacterium Sharmanii iv Production of blood-cholesterol lowering agent
(A) (B) (C) (D) (a) (iv) (iii) (ii) (i) (b) (iv) (ii) (i) (iii) (c) (iii) (i) (iv) (ii) (d) (iii) (iv) (i) (ii) 33. Microbe used for biocontrol of pest butterfly caterpillars is [NEET Kar. 2013] (a) Trichoderma sp. (b) Saccharomyces cerevisiae (c) Bacillus thuringiensis (d) Streptococcus sp. 34. Which one of the following microbes forms symbiotic association with plants and helps them in their nutrition [2012] (a) Azotobacter (b) Aspergillus (c) Glomus (d) Trichoderma 35. A nitrogen-fixing microbe associated with Azolla in rice fields is : [2012] (a) Spirulina (b) Anabaena (c) Frankia (d) Tolypothrix 36. In gobar gas, the maximum amount is that of [2012M] (a) butane (b) methane (c) propane (d) carbon dioxide 37. An organism used as a biofertilizer for raising soyabean crops is [2011] (a) Azotobacter (b) Azospirillum (c) Rhizobium (d) Nostoc 38. Which one of the following help in absorption of phosphorus from soil by plants? [2011] (a) Glomus (b) Rhizobium (c) Frankia (d) Anabaena 39. Which one of the following is not a biofertilizer? [2011] (a) Agrobacterium (b) Rhizobium (c) Nostoc (d) Mycorrhiza 40. A common biocontrol agent for the control of plant diseases is [2010] (a) Baculovirus (b) Bacillus thuringiensis (c) Glomus (d) Trichoderma 41. The common nitrogen fixer in paddy fields is [2010] (a) Rhizobium (b) Azospirillum (c) Oscillatoria (d) Frankia 42. Which one of the following is not used in organic farming? [2010] (a) Glomus (b) Earthworm (c) Oscillatoria (d) Snail 43. Select the correct statement from the following? [2010] (a) Biogas is produced by the activity of aerobic bacteria on animal waste (b) Methanobacterium is an aerobic bacterium found in rumen of cattle (c) Biogas, commonly called gobar gas, is pure methane (d) Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria 44. Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide? [2008] (a) Bacterial leaf blight of rice (b) Downy mildew of grapes (c) Loose smut of wheat (d) Black rust of wheat 45. For retting of jute the fermenting microbe used is [2005] (a) Methophilic bacteria (b) Butyric acid bacteria (c) Helicobactor pylori (d) Streptococcus lactin 46. Which of the following is pair of biofertilizers? [2001] (a) Azolla and BGA (b) Nostoc and legumes (c) Rhizobium and grasses (d) Salmonella and E. coli 47. The aquatic fern, which is an excellent biofertiliser is [1999] (a) Azolla (b) Salvinia (c) Marsilia (d) Pteridium 48. Due to which of the following organisms, yield of rice has been increased ? [1999] (a) Anabaena (b) Bacillus popilliae (c) Sesbania (d) Bacillus polymexa 49. Which one of the following is non-symbiotic biofertilizer? [1998] (a) Azotobacter (b) Anabaena (c) Rhizobium (d) VAM. 50. Farmers have reported over 50% higher yields of rice by using the biofertilizer [1998] (a) Azolla pinnata (b) Cyanobacteria (c) Legume-Rhizobium symbiosis (d) Mycorrhiza Answer key
1 b 11 b 21 b 31 c 41 b
2 c 12 b 22 b 32 d 42 d
3 b 13 c 23 c 33 c 43 d
4 b 14 a 24 a 34 c 44 b
5 d 15 a 25 a 35 b 45 b
6 d 16 d 26 b 36 b 46 a
7 d 17 b 27 c 37 c 47 a
8 b 18 a 28 c 38 a 48 a
9 c 19 c 29 d 39 a 49 a
10 a 20 c 30 d 40 d 50 a