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12th Standard English Medium Biology (Zoology) Subject Microbes in Human Welfare Book Back 1 Mark Questions with Solution Part - II

12th Standard

    Reg.No. :
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Biology

Time : 01:00:00 Hrs
Total Marks : 5

    1 Marks

    5 x 1 = 5
  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. CO2 is not released during

    (a)

    Alcoholic fermentation

    (b)

    Lactate fermentation

    (c)

    Aerobic respiration in animals

    (d)

    Aerobic respiration in plants

  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.

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