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12th Standard Bio-Zoology English Medium Microbes in Human Welfare Reduced Syllabus Important Questions 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 pair is correctly

    (a)

    Acetobacter aceti - Antibiotics

    (b)

    Methanobacterium - Lactic acid

    (c)

    Penicilium notatum - Acetic acid

    (d)

    Saccharomyces cerevisiae - Ethanol

  2. CO2 is not released during

    (a)

    Alcoholic fermentation

    (b)

    Lactate fermentation

    (c)

    Aerobic respiration in animals

    (d)

    Aerobic respiration in plants

  3. The purpose of biological treatment of waste water is to _______

    (a)

    Reduce BOD

    (b)

    Increase BOD

    (c)

    Reduce sedimentation

    (d)

    Increase sedimentation

  4. WorId Biofuel day is observed on_______

    (a)

    10th September

    (b)

    22nd April

    (c)

    10th August

    (d)

    17th October

  5. Aspergillus niger helps to produce________

    (a)

    Citric acid

    (b)

    Acetic acid

    (c)

    Turmeric acid

    (d)

    Lactic acid

  6. _________got from fungi is used as an immune suppressant in organ transplantation.

    (a)

    Statin

    (b)

    Cyclosporin A

    (c)

    Insulin

    (d)

    Protease

  7. ________is not used as a biofertilizer

    (a)

    Bacillus thuringiensis

    (b)

    Rhizobium

    (c)

    Nostoc

    (d)

    Anabaena

  8. ______is not a part of MFC

    (a)

    Bacteria

    (b)

    Semi permeable Membrane

    (c)

    Cathode

    (d)

    Electric circuit

  9. The cry toxin affects_______system of insect pests

    (a)

    Nervous system

    (b)

    Respiratory system

    (c)

    Digestive system

    (d)

    Reproductive system

  10. ________is not a biocontrol agent

    (a)

    Trichoderma

    (b)

    Dragonfly

    (c)

    Glomus

    (d)

    Buculovirus

  11. Rhizopus oryzae can produce_________

    (a)

    Fumaric acid

    (b)

    Malic acid

    (c)

    Acetic acid

    (d)

    Citric acid

  12. Read the following four statements (A to D):
    a) Colostrums is recommended for the newborn because it is rich in antigen.
    b) Chikungunya is caused by a gram negative bacterium.
    c) Tissue culture has proved useful in obtaining virus-free plants.
    d) Beer is manufactured by distillation of fermented grape juice
    How many of the above statements are wrong?

    (a)

    Three

    (b)

    Four

    (c)

    One

    (d)

    Two

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

    (a)

    Archaebacteria

    (b)

    Eubacteria

    (c)

    Blue-green algae

    (d)

    Saprophytic fungi

  14. Match Column - I with Column - II and select the correct options using the codes given below:

    Column I Column II
    A. Citric acid 1. Trichoderma
    B. Cyclosporin A 2. Clostridium
    C. Statins 3. Aspergillus
    D. Butyric acid 4. Monoscus
    (a)

    A:3, B:1, C:4, D:2

    (b)

    A:1, B:4, C:2, D:3

    (c)

    A:3, B:4, C:1, D:2

    (d)

    A:3, B:1, C:2, D:4

  15. Chlortetracycline was isolated from the culture _________________

    (a)

    Streptomyces aureofaciens

    (b)

    Streptomyces griseus

    (c)

    Streptococcus lactis

    (d)

    Aspergillus niger

  16. 2 Marks

    10 x 2 = 20
  17. Give any two bioactive molecules produced by microbes and state their uses.

  18. What is biological oxygen demand?

  19. What are probiotics? Give examples.

  20. What is antibiosis?

  21. What is zymology?

  22. What is the use oflipases in Industries?

  23. What is rennet?

  24. Define bioremediation

  25. Why is curd more nutritious than milk?

  26. Define LAB

  27. 3 Marks

    10 x 3 = 30
  28. Explain the role of cry-genes in genetically modified crops.

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

  30. How is bread prepared by microbial action?

  31. What is penicillin?

  32. What is Cydosporin A?

  33. UV is an ideal disinfectant for waste water. Give Reason

  34. What is organic farming?

  35. Draw a microbial fuel cell and label the parts

  36. Name the scientists who were awarded Nobel Prize in.1945 for discovering the penicillin drug & its role as an antibiotic.

  37. Write a short on "Pathaneer".

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

  41. Explain the process of sewage treatment.
     

  42. Explain the working of a biogas plant

  43. Explain the role of microbes in the production of enzymes & bio-active molecules

  44. Describe the stages of Sewage treatment process

  45. Bioremediation & microbes - Discuss.

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