Microbes in Human Welfare MCQs

There are many microbes around us as well as inside us. Most are harmful and can cause many diseases. However, others, such as the ones present in our gut, are quite beneficial. They promote good health and wellness. Microbes in Human Welfare MCQs are designed specifically to help understand concepts and their real-world implications.

MCQs on Microbes in Human Welfare

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. Waterbody 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 primarily 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. Example of a natural insect repellant
    1. Citronella oil
    2. Coconut oil
    3. Linseed oil
    4. None of the above
11. Why is wine distilled?
    1. To reduce toxicity
    2. To enable fermentation
    3. To prevent spoilage
    4. To increase the alcohol percentage
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 the 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. Carotenoid
    3. Mauveine
    4. None of the above
15. Bacillus thuringiensis is widely used as:
    1. Insecticide
    2. Weedicides
    3. Rodenticide
    4. None of the above

Answer Key

Further Reading:

• Important Question for Class 11
• Important Questions for Class 12
• Biology MCQs
• Biology