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Microbes In Human Welfare

Board » Bihar Board » Class 12th » English Medium » Science » Biology » L-10 : Microbes In Human Welfare

Objective Questions (MCQs)

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ID- 6319
BSEB, 2019 (C)

1. Blue green algae and Rhizobium are parents in root nodules of plants of which family?

  • (A) Apocynaceae
  • (B) Asteraceae
  • (C) Leguminosae
  • (D) Poaceae
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ID- 6320
BSEB, 2019 (C)

2. Which can perform the main role in Biological nitrogen fixation?

  • (A) Nostoc
  • (B) Anabaena
  • (C) Blue-green algae
  • (D) All of these
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ID- 6321
BSEB, 2020 (A)

3. Which bacteria are untilised in gobar gas plant?

  • (A) Nitrifying bacteria
  • (B) Ammonifying bacteria
  • (C) Denitrifying bacteria
  • (D) Mathanogens
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ID- 6322
BSEB, 2020 (A)

4. Cyanobacteria are useful niofertilizers in the field of:

  • (A) Maize
  • (B) Wheat
  • (C) Sugarcane
  • (D) Rice
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ID- 6323
BSEB, 2020 (A)

5. High amount of E.coil water is an indicator of:

  • (A) Hardness of water
  • (B) Industrial pollution
  • (C) Sewage pollution
  • (D) All of these
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ID- 6324
BSEB, 2012

6. Which of the following is an important source of biofertilizer?

  • (A) Green algae
  • (B) Yeast
  • (C) Bacteria
  • (D) Red algae
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ID- 6325
BSEB, 2012

7. The bacteria found in the root modules of leguminous plants are:

  • (A) Rhizobium
  • (B) Azotobacter
  • (C) Staphylococcus
  • (D) Lactobacillus
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ID- 6326
BSEB, 2015, 2021 (A)

8. The floor of Idli and Dosa is made by the use of which microbe?

  • (A) Bacteria
  • (B) Lactobacillus
  • (C) Virus
  • (D) Yeast
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ID- 6327
BSEB, 2015, 2021 (A)

9. Honey is made by:

  • (A) male honeybee
  • (B) queen honeybee
  • (C) worker honeybee
  • (D) both 'A' and 'B'
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ID- 6328
BSEB, 2013, 2021 (A)

10. Pasteurization is heating of:

  • (A) milk only
  • (B) any liquid at 100°C
  • (C) any liquid above 70°C
  • (D) any liquid between 70°C – 80°C followed by rapid
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ID- 6811
BSEB, 2015, 2021 (A)

11. T-lymphocytes orginate from:

  • (A) bone-marrow
  • (B) stomach
  • (C) thymus
  • (D) liver
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ID- 6812

12. Which one is used to preparation of bread:

  • (A) Lactobacillus
  • (B) Streptobacillus
  • (C) Aspergillus
  • (D) S. cerevisiae
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ID- 6813
BSEB, 2018 (A)

13. Probiotics are:

  • (A) New kind of food allergens
  • (B) Safe antibotics
  • (C) Live microbial food supplement
  • (D) Cancer inducing microbes
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ID- 6814

14. Trichoderma harzianum is useful for:

  • (A) Bioremediation
  • (B) Gene transfer
  • (C) Reclamation waste lands
  • (D) Biocontrol of soil borne plant pathogens
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ID- 6815

15. Modern detergents have enzyme preparations of:

  • (A) Thermophiles
  • (B) Thermoacidophiles
  • (C) Acidophiles
  • (D) Alkaliphiles
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ID- 6816

16. Bacillus thiringiensis (Bt) strains have been used for designing novel:

  • (A) Bio-metallurgical techniques
  • (B) Bio-metallurgical process
  • (C) Bio-insecticidal plants
  • (D) Bio-fertilizers
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ID- 6817

17. Nif gene occurs in:

  • (A) Penicillin
  • (B) Rhizobium
  • (C) Aspergillus
  • (D) Streptococcus
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ID- 6818

18. Term antibiotic was first used by:

  • (A) Flemming
  • (B) Pasteur
  • (C) Waksman
  • (D) Lister
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ID- 6819
BSEB, 2018 (C)

19. Which of the fungus produces cyclosporine A, an immuno suppressive agent used in organ transplanted patient?

  • (A) Trichoderma Polysperma
  • (B) Erysiphae
  • (C) Puccinia gramins
  • (D) Peziza
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ID- 6822
BSEB, 2018 (C)

20. The group of bacteria, which grow anaerobically on the cellulose material in anaerobic sludge digester and rumen of cattle are called:

  • (A) Methanogen
  • (B) Plasmalogen
  • (C) Immunogen
  • (D) None of these
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ID- 6824
BSEB, 2019 (A)

21. For Nitrogen fixation in soil we may use:

  • (A) Cyanobacteria
  • (B) Protozoans
  • (C) Nematodes
  • (D) Wheat plants
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ID- 6826
BSEB, 2019 (A)

22. Brawery is concerned with:

  • (A) Saccharomyces
  • (B) Protozoans
  • (C) Pteridophytes
  • (D) Marsupials
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ID- 6828

23. Which of the following microbes is a proteinacious infectious agent?

  • (A) Fungi
  • (B) Prions
  • (C) Bacteria
  • (D) Protozoa
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ID- 6831

24. 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
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ID- 6834

25. Which of the following organisms is used in the production of beverages?

  • (A) Penicillium notatum
  • (B) Saccharomyces cerevisiae
  • (C) Aspergillus niger
  • (D) Clostridium butylicum
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ID- 6835

26. Statins used to lowering blood-cholesterol level are extracted from:

  • (A) algae
  • (B) bacteria
  • (C) viruses
  • (D) yeast
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ID- 6836

27. Monascus purpureus is a yeast commercially used in the production of:

  • (A) citric acid
  • (B) ethanol
  • (C) blood cholesterol lowering statins
  • (D) streptokinase for removing clots from blood vessels
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ID- 6837

28. Which of the following antibiotics is used to cure throat infections?

  • (A) Neomycin
  • (B) Polymixin
  • (C) Tetracyclines
  • (D) Viridin
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ID- 6838

29. Which of the following steps is taken by the Ministry of Environment and Forest to protect rivers from water pollution?

  • (A) Ganga Action Plan
  • (B) Narmada Action Plan
  • (C) Yamuna Action Plan
  • (D) Both 'A' and 'C'
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ID- 6839

30. The purpose of biological treatment of waste water is to:

  • (A) reduce BOD
  • (B) increase BOD
  • (C) reduce sedimentation
  • (D) increase sedimentation
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ID- 6840

31. Process of biogas production is:

  • (A) aerobic process
  • (B) anaerobic process
  • (C) active process
  • (D) passive process
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ID- 6841

32. Which of the following is not used as a biopesticide?

  • (A) Trichoderma harzianum
  • (B) Nucleopolyhedrovirus
  • (C) Xanthomonas campestris
  • (D) Bacillus thuringiensis
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ID- 6842

33. A microbial biocontrol agent that can be used to control butterfly caterpillars is:

  • (A) Trichoderma polysporum
  • (B) Bacillus thuringiensis
  • (C) Streptococcus
  • (D) Mycorhiza
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ID- 6843

34. Bio-pesticide are:

  • (A) the chemicals which are used to destroy the pests
  • (B) the living organism or their products which are used for the pest control
  • (C) the organism which destroy the crops
  • (D) none of these
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ID- 6851

35. Integrated Pest Management (IPM) discouraged the excessive use of:

  • (A) biological methods
  • (B) chemical pesticides
  • (C) mechanical methods
  • (D) all of these
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ID- 6852

36. Organic farming includes:

  • (A) use of fertilizers and pesticides of biological origin
  • (B) IPM (Integrated Pest Management)
  • (C) locally developed pest resistant varieties
  • (D) all of these
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ID- 6854

37. Cyanobacteria are:

  • (A) heterotrophs
  • (B) chemotrophs
  • (C) autotrophs
  • (D) organotrophs
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ID- 6857

38. Azolla pinnata has been found to be an important bio-fertilizer for paddy crops. This quality is due to the presence of:

  • (A) N2 fixing bacteria
  • (B) N2 fixing cyanobacteria
  • (C) mycorhizae
  • (D) all of these
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ID- 6859

39. Bio-fertilizers are:

  • (A) some bacteria are cyanobacteria
  • (B) fertilizers formed by ploughing in barseem
  • (C) fertilizers obtained by decay of dead organisms
  • (D) fertilizers prepared by mixing cattle dung with crop residues
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ID- 6861

40. Which of the following is a non-symbiotic biofertilizer?

  • (A) VAM
  • (B) Azotabacter
  • (C) Anabaena
  • (D) Rhizobium
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ID- 6864

41. Which of the following is widely used a successful biofertilizer in Indian rice fields?

  • (A) Rhizobium
  • (B) Acacia arabica
  • (C) Acalypha indica
  • (D) Azolla pinnata
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ID- 6865

42. BOD of waste water is estimated by measuring the amount of:

  • (A) total organic matter
  • (B) biodegradable organic matter
  • (C) oxygen evolution
  • (D) oxygen consumption
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ID- 6867
BSEB, 2021 (A)

43. Agarose is extracted from:

  • (A) Maize
  • (B) Sea weeds
  • (C) Cycas
  • (D) None of these
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ID- 6868
BSEB, 2021 (A)

44. Who among the following is not related with microbiology?

  • (A) Louis Pasteur
  • (B) J. D. Watson
  • (C) Stephan Hales
  • (D) Robert koch
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ID- 6870

45. The residue left after methane production from cattle dung is:

  • (A) burnt
  • (B) burried in land fills
  • (C) used as manure
  • (D) used in civil construction
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ID- 6871
BSEB, 2016, 2021 (A)

46. Chlorella is a type of:

  • (A) bacteria
  • (B) virus
  • (C) protozoa
  • (D) single cell protein
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ID- 6873
BSEB, 2016, 2017 (C)

47. Which microbe is useful in the formation of curd from milk?

  • (A) Clostridium
  • (B) Lactobacillus
  • (C) Both 'A' and 'B'
  • (D) Streptococcus
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ID- 6876
BSEB, 2016

48. Which of the following are single cell protein?

  • (A) Spirulina
  • (B) Chlorella
  • (C) Scenadesmus
  • (D) All of these
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EXPLANATION:

Chlorella is an algae of great importance, as it has a high amount of protein and is also used by space travellers as food supplement. It is used as a single celled protein.

Single cell protein is a protein obtained from pure or mixed cultures of algae, bacteria etc. that have 30-70% of protein content in their dry mass.

SCP are rich source of protein (60-72%), vitamins, amino acids, minerals and crude fibres. Hence they are extensively used as food. There are many organisms which are used for the production of SCP. They are Chlorella, Spirulina and Chlamydomonas. Thus the correct answer is "Chlorella ".

Therefore, option B is correct.

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ID- 6878
BSEB, 2017 (A)

49. Bio Fertilizer is present in root nodules of which non-leguminous plant?

  • (A) Azotobactor
  • (B) Clostridium
  • (C) Frankia
  • (D) None
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ID- 6880
BSEB, 2018 (A)

50. Messes of bacteria associated with fungal filament to form a mesh like structure is called:

  • (A) Flocs
  • (B) Methanogen
  • (C) Plasminogen
  • (D) None of these
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