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Class 12 Biology Objective In English Chapter - 10 Microbes in Human Welfare

Class 12 Biology Objective In English Chapter – 10 Microbes in Human Welfare

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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 )

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