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Class 12 Biology Objective In English Chapter – 10 Microbes in Human Welfare
1. Brewery is connected with
( A ) Saccharomyces
( B ) Protozoans
( C ) Pteridophytes
( D ) Marsupials
Ans-( A )
2. For Nitrogen fixation in soil we may use
( A ) Cyanobacteria
( B ) Protozoans
( C ) Nematodes
( D ) Wheat plants
Ans-( A )
3. Which of the following antibiotics was extensively used to treat american soldiers wounded in world war II.
( A ) Neomycin
( B ) Bacitracin
( C ) Chloramphenicol
( D ) Penicillin
Ans-( D )
4. Probiotics are :
( A ) New kind of food allergens.
( B ) Safe antibiotics
( C ) Live microbial food supplement
( D ) Cancer inducing microbes
Ans-( C )
5. Organic farming does not include
( A ) green manures
( B ) chemical fertilizers
( C ) farmyard manures
( D ) compost
Ans-( B )
6. Farmers have reported 50% higher rice yield by the use of biofertilizers?
( A ) Bacillus thuringiensis
( B ) Rhizobium
( C ) Mycorrhizae
( D ) Azolla pinnata
Ans-( D )
7. Third generation pesticides are :
( A ) Insect repellants
( B ) Pheromones
( C ) Pathogens
( D ) Insect hormone analognes
Ans-( D )
8. Which of the following can cause molecular nitrogen as nutrient ?
( A ) Methanomonas
( B ) Mucor
( C ) Rhizobium
( D ) Spirogyra
Ans-( C )
9. Industrial production of ethanol fromstarch is brought about by a certain species of :
( A ) Penicillin
( B ) Azotobacter
( C ) Saccharomyces
( D ) Lactobacillus
Ans-( C )
10. Process of biogas production is :
( A ) aerobic
( B ) anaerobic
( C ) active process
( D ) passive process
Ans-( B )
11. Which of the following is not biofertilizer ?
( A ) Azotobacter
( B ) Bacillus thuringiensis
( C ) Clostridium
( D ) Azolla
Ans-( B )
12. Masses of bacteria associated with fungal filament to form a mesh like structure is called :
( A ) Flocs
( B ) Methanogen
( C ) Plasminogen
( D ) None of these
Ans-( A )
13. The toxic protein secreted by Bacillus thuringiensis is:
( A ) Tubulin
( B ) Insulin
( C ) Cry protein
( D ) All
Ans-( C )
14. Which of the following is a retro virus?
( A ) Human Immuno Deficienyc virus
( B ) Hepatitis virus
( C ) Microvirus Influenzil
( D ) All of these
Ans-( A )
15. Which microbe is useful in the formation of curd from milk ?
( A ) Clostridium
( B ) Lactobacillus
( C ) Both (A) and (B)
( D ) Streptococcus
Ans-( B )
16. The flour of Idli & Dosa is made by the use of which microbe ?
( A ) Bacteria
( B ) Lactobacillus
( C ) Virus
( D ) Yeast
Ans-( A )
17. Which one of the following is helpful in the improvement of soil ?
( A ) Insecticide
( B ) Biofertilizer
( C ) Yeast
( D ) None of these
Ans-( B )
18. Aquatic fern which is an excellent biofertilizer :
( A ) Salvinia
( B ) Azolla
( C ) Marsellia
( D ) Pteridium
Ans-( B )
19. Which of the following microbes is a proteinaceous infectious agents ?
( A ) Fungi
( B ) Prions
( C ) Bacteria
( D ) Protozoa
Ans-( B )
20.Cyanobacteria are :
( A ) heterotrophs
( B ) chemotrophs
( C ) autotrophs
( D ) organotrophs
Ans-( C )
21. The chemicals produced by some microbes to kill or retard the growth of other microbes are called :
( A ) antiseptics
( B ) antacid
( C ) antibiotics
( D ) all
Ans-( C )
22. Which of the following was an accidental discovery ?
( A ) Penicillin
( B ) Insulin
( C ) Chloramphenicol
( D ) DNA
Ans-( A )
23 Sour taste of vinegar is due to :
( A ) Lactic acid
( B ) acetic acid
( C ) butyric acid
( D ) fumaric acid
Ans-( B )
24. Which one is biofertilizer ?
( A ) Mycorrhiza
( B ) Nitrogen fixing bacteria
( C ) Nitrogen fixing cyanobacteria
( D ) All the above
Ans-( D )
25. Some blue green algae are used as biofertiliser because they can:
( A ) Fix nitrogen
( B ) Secrete nuclilage
( C ) Perform photosynthesis
( D ) Grow everywhere
Ans-( A )
26. An insect repellent neem product is :
( A ) Rotenone
( B ) Azadirachtin
( C ) Parathion
( D ) Endrin
Ans-( B )
27. Bt cotton is resistant to :
( A ) Insects
( B ) Herbicides
( C ) Salt
( D ) Drought
Ans-( A )
28. The process of increasing soil fertility by earth worms is
( A ) Worm casting
( B ) Vermi composting
( C ) Compost bedding
( D ) None of these
Ans-( B )
29. In gobar gas maximum amount is that of :
( A ) Propane
( B ) Methane
( C ) Butane
( D ) CO2
Ans-( B )
30. Which of the following step is taken by Govt. of India to protect rivers from water pollution ?
( A ) Ganga action plan
( B ) Narmada action plan
( C ) Yamuna action plan
( D ) Both (A) and (C)
Ans-( D )
31. Bacteria present in the rumen of cattle is :
( A ) Azotobacter
( B ) Rhizobium
( C ) Methanobacterium
( D ) Azospirillum
Ans-( C )
32. In the sewage treatement, bacterial of are allowed to sediment in a settling tank. This sediment is called :
( A ) inactivated sludge
( B ) activated sludge
( C ) primary sludge
( D ) secondary sludge
Ans-( B )
33. During primary treatment of sewage solid particles that settle down are called
( A ) flocs
( B ) primary sludge
( C ) activated sludge
( D )anaerobic sludge
Ans-( B )
34. Which of the following organism is used in the production of beverages?
( A ) Penicillium notatum
( B ) sacharomyces cerevisac
( C ) Aspergillus niger
( D ) Clostridium butylicum
Ans-( B )
35. ‘Yeast’ is an important source of :
( A ) Vitamin C
( B ) riboflavin
( C ) Sugars
( D ) Proteins
Ans-( B )
36. Formation of vinegar from alcohol is caused by :
( A ) Bacillus subtilis
( B ) Clostridium
( C ) Acetobacter aceti
( D ) Azotobacter
Ans-( C )
37. The bacterium capable of anaerobic N2-fixation is known as:
( A ) Azotobacter
( B ) Clostridium
( C ) Bacillus
( D ) Rhizobium
Ans-( B )
38. The symbiotic association between fungi and roots of higher plants is called :
( A ) Lichen
( B ) mycorrhiza
( C ) biofertilizer
( D ) biocontrol agent
Ans-( B )
39. Statins used for lowering blood-cholesterol level are extracted from:
( A ) algae
( B ) bacteria
( C ) viruses
( D ) yeasts
Ans-( D )
40. Which is the first step of sewage treatment
( A ) Precipitation
( B ) Chlorination
( C ) Sedimentation
( D ) Aeration
Ans-( C )
41. Integrated Pest management discourages the excessive use of :
( A ) biological methods
( B ) chemical pesticides
( C ) mechanical methods
( D ) All
Ans-( B )
42. Which in the following is a non- symbiotic biofertilizer?
( A ) VAM
( B ) Azotobacter
( C ) Anabaena
( D ) Rhizobium
Ans-( B )
43. Bacillus thuringiensis is used to control
( A ) bacterial pathogens
( B ) fungal pathogens
(C ) nematodes
( D) insect pests
Ans-( D )
44. Which is widely used successful biofertilizer in Indian rice fields ?
( A ) Rhizobium
( B ) Acacia
( C ) Acalypha
( D ) Azolla
Ans-( D )
45. N2-fixation in root nodules of almus is brought about by
( A ) Frankia
( B ) Azorhizobium
( C ) Bradyrhizobium
( D ) Clostridium
Ans-( A )
46. Name the fungus used for steroid synthesis ?
( A ) Aspergillus oryzae
( B ) Torulopsis utilis
( C ) Rhizopus stolonifer
( D ) Neurospora cross
Ans-( C )
47. A major component of gobar gas is :
( A ) butane
( B ) ammonia
( C ) methane
( D ) ethane
Ans-( C )
48. Baker’s yeast in the following is :
( A ) S.Cerevisae
( B ) S.ludwingia
( C ) S.Octosporus
( D ) Sehizosaccharomyces
Ans-( A )
49. Most commonly used green manures in India are :
( A ) Crotolaria Juncea
( B ) Sesabaria aculeata
( C ) Cyamopsis tetragonoloba
( D ) All
Ans-( D )
50. Which one is not used as a biopesticide?
( A ) Trichoderma harzianum
( B ) Nucleopolyhedrovirus
( C ) Xanthomonas campestris
( D ) Bacillus thuringiensis
Ans-( C )
51. Streptomycin is obtained from :
( A ) Streptomyces griseus
( B ) S. cerevisae
( C ) S. venezuelae
( D ) S. ramosus
Ans-( B )
