Zoology - Microbes in Human Welfare Book Back Questions

12th Standard EM

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Biology

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5
  1. Cyclosporin – A is an immunosuppressive drug produced from _______

    (a)

    Aspergillus niger

    (b)

    Manascus purpureus

    (c)

    Penicillium notatum

    (d)

    Trichoderma polysporum

  2. Which of the following bacteria is used extensively as a bio-pesticide?

    (a)

    Bacillus thurigiensis

    (b)

    Bacillus subtilis

    (c)

    Lactobacillus acidophilus

    (d)

    Streptococcus lactis

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

    (a)

    Pseudomonas

    (b)

    Azotobacter

    (c)

    Anabaena

    (d)

    Nostac

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

    (a)

    Reduce BOD

    (b)

    Increase BOD

    (c)

    Reduce sedimentation

    (d)

    Increase sedimentation

  5. The gases produced in anaerobic sludge digesters are

    (a)

    Methane, oxygen and hydrogen sulphide

    (b)

    Hydrogen sulphide, methane and sulphur dioxide

    (c)

    Hydrogen sulphide, nitrogen and methane

    (d)

    Methane, hydrogen sulphide and CO2.

  6. 3 x 2 = 6
  7. How is milk converted into curd? Explain the process of curd formation

  8. Give any two bioactive molecules produced by microbes and state their uses.

  9. What is biological oxygen demand?

  10. 3 x 3 = 9
  11. Explain the role of cry-genes in genetically modified crops.

  12. Write the key features of organic farming.

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

  14. 2 x 5 = 10
  15. List the advantages of biogas plants in rural areas.

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

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