MCQs on “Microbes in Human Welfare”

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  1. Which of these processes does not give off CO₂
    1. Lactate fermentation
    2. Aerobic respiration
    3. Alcoholic fermentation
    4. None of the above
  2. High biological oxygen demand in a water body means ______
    1. Water is not polluted
    2. Water is polluted
    3. Water body contains lots of lifeforms
    4. None of the above
  3. The guts of various ruminants contain
    1. Acidophiles
    2. Halophiles
    3. Methanogens
    4. All of the above
  4. Which of the following microbes are used for the commercial production of citric acid?
    1. Xanthomonas citri
    2. Asparagine
    3. Asparagus
    4. Aspergillus
  5. Saccharomyces cerevisiae is used for
    1. Baking
    2. Bleaching
    3. Biofuel
    4. None of the above
  6. Acinetobacter baumannii is a
    1. Decomposing bacteria
    2. Pathogenic bacteria
    3. Nitrogen fixing bacteria
    4. None of the above
  7. Ethanol can be produced using
    1. Saccharomyces cerevisiae
    2. Escherichia coli
    3. Pseudomonas syringae
    4. None of the above
  8. Bacillus thuringiensis is used for
    1. Fermentation of beer
    2. Biopesticide
    3. Antibiotic
    4. None of the above
  9. Before antibiotics, the first commercial antibacterial available was
    1. Penicillin
    2. Prontosil
    3. Azithromycin
    4. None of the above
  10. Why is wine distilled?
    1. To reduce toxicity
    2. To enable fermentation
    3. To prevent spoilage
    4. To increase the alcoholic percentage
  11. Example of a natural insect repellent
    1. Citronella acid
    2. Coconut acid
    3. Linseed oil
    4. None of the above
  12. Which of the following is used as a substrate for alcohol fermentation?
    1. Maize
    2. Barley
    3. Sucrose
    4. None of the above
  13. Antibiotics are most effective on
    1. Bacteria
    2. Virus
    3. Fungi
    4. None of the above
  14. _________ is a pigment that gives a pinkish hue to rhizobium induced root nodules
    1. Leghaemoglobin
    2. Caratenoid
    3. Mauveine
    4. None of the above
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