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12th Standard Bio-Zoology English Medium Microbes in Human Welfare Reduced Syllabus Important Questions With Answer Key 2021

12th Standard

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Biology

Time : 01:00:00 Hrs
Total Marks : 100

    Multiple Choice Questions

    15 x 1 = 15
  1. Which of the following bacteria is used extensively as a bio-pesticide?

    (a)

    Bacillus thurigiensis

    (b)

    Bacillus subtilis

    (c)

    Lactobacillus acidophilus

    (d)

    Streptococcus lactis

  2. Which of the following is not involved in nitrogen fixation?

    (a)

    Pseudomonas

    (b)

    Azotobacter

    (c)

    Anabaena

    (d)

    Nostac

  3. The enzyme________is got from Aspergillus.

    (a)

    Rennet

    (b)

    Zymase

    (c)

    Amylase

    (d)

    Lipase

  4. ________is not used as a biofertilizer

    (a)

    Bacillus thuringiensis

    (b)

    Rhizobium

    (c)

    Nostoc

    (d)

    Anabaena

  5. Biofertilizers are not involved in this process

    (a)

    increase water holding capacity of soil

    (b)

    Help to degrade pollutants

    (c)

    Provide nutrients

    (d)

    Improve soil texture

  6. _______is a prokaryotic organism helping to improve fertility of the soil

    (a)

    Glomus

    (b)

    Azolla

    (c)

    legume

    (d)

    Tolypothrix

  7. Rhizopus oryzae can produce_________

    (a)

    Fumaric acid

    (b)

    Malic acid

    (c)

    Acetic acid

    (d)

    Citric acid

  8. Which of the following are likely to be present in deep-sea water?

    (a)

    Archaebacteria

    (b)

    Eubacteria

    (c)

    Blue-green algae

    (d)

    Saprophytic fungi

  9. What gases are produced in anaerobic sludge digesters?

    (a)

    Methane and CO2 only

    (b)

    Methane, hydrogen sulphide and CO2

    (c)

    Methane, hydrogen sulphide and O2

    (d)

    Hydrogen sulphide and CO

    (e)

    Consumption of organic matter in the water is higher by the microbes

  10. Which of the following is wrongly matched in the given table?

    (a)
    Microbe Product Application
    Trichoderma polysporum Cyclosporin A Immunosuppressive drug
    (b)
    Microbe Product Application
    Monascus purpureus Statins Lowering of blood cholesterol
    (c)
    Microbe Product Application
    Streptococcus Sterptockinase Removal of clot from blood vessel
    (d)
    Microbe Product Application
    Clostridium butylicum Lipase Removal of oil stains
  11. Name the person who was the first to use the term antibiotic

    (a)

    Selman Waksman

    (b)

    Alexander Flemming

    (c)

    Earnest Chain

    (d)

    Howard Florey

  12. Chlortetracycline was isolated from the culture _________________

    (a)

    Streptomyces aureofaciens

    (b)

    Streptomyces griseus

    (c)

    Streptococcus lactis

    (d)

    Aspergillus niger

  13. Assertion (A): Oenology deals with study of wine and its preparation.
    Reason (R): Zymology deals with biochemical process of fermentation and its uses.

    (a)

    A is right R is wrong

    (b)

    R explains A.

    (c)

    A and R are wrong.

    (d)

    A and R are right. R cannot explain A.

  14. Which of the following plant species is the most suitable oilseed for biodirect production?

    (a)

    Ground nut

    (b)

    Areca nut

    (c)

    Jatropha curcas

    (d)

    Phyllanthus anarus

  15. Corn \(\overset { A }{ \rightarrow } \) Fermentable sugars \(\overset { B }{ \rightarrow } \) Ethanol. Find out A and B for above statement.

    (a)

    A - Agaricus, B - Sarcina

    (b)

    A - Zymomonas, B - Vinegar

    (c)

    A - Rhizopus, B - Aspergillus

    (d)

    A - Aspergillus, B - Yeast

  16. 2 Marks

    10 x 2 = 20
  17. How is milk converted into curd? Explain the process of curd formation

  18. What is biological oxygen demand?

  19. How are antibiotics classified?

  20. What is antibiotic resistance?

  21. Write the equation for fermentation of glucose

  22. Why is curd more nutritious than milk?

  23. Compare Broad spectrum antibiotics with narrow-spectrum antibiotics

  24. What is studied under zymology and oenology?

  25. Complete the table by filling with respective organic acid and microbes.

    Organic acid Microbes
    Acetic acid ............W..........
    .......X....... Aspergillus niger
    Fumaric acid ...........Y...........
    ........Z........ Clostridium butyricum
  26. Name the biocontrol agents used to get rid of Aphids & mosquito larvae

  27. 3 Marks

    10 x 3 = 30
  28. Write the key features of organic farming.

  29. Justify the role of microbes as a bio-fertilizer

  30. How is yoghurt produced?

  31. What is SCP?

  32. How can we avoid antibiotic resistance?

  33. What is 'activated sludge' in sewage treatment?

  34. How does Delta-endotoxin affect insects?

  35. What are bio weedicides?

  36. Explain the types of bioremediation

  37. Name the act enforced by government to conserve water bodies. Also, mention its objectives.

  38. 5 Marks

    7 x 5 = 35
  39. Write short notes on the following.
    a) Brewer's yeast
    b) Ideonella sakaiensis
    c) Microbial fuel cells

  40. When does antibiotic resistance develop?

  41. What is the key difference between primary and secondary sewage treatment?

  42. Explain the process of sewage treatment.
     

  43. Explain the working of a biogas plant

  44. Describe the stages of Sewage treatment process

  45. Bioremediation & microbes - Discuss.

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