Microbes in Human Welfare
Quiz covering the role of microbes in food production, medicine, waste management, biogas generation, biofertilizers, and industrial applications
Questions
Cow dung used for biogas production is rich in
- Rhizobium
- Methanobacterium
- Acetobacter aceti
- Lactobacillus
- All of the above
Which of the following statements is/are true regarding the microbe Lactobacillus?
(a) It grows in milk and converts it into cheese.
(b) It grows in curd.
(c) It is commonly called lactic acid bacterium.
(d) LAB produces acids that coagulate and partially digest the milk proteins.
(e) It improves the nutritional quality of the milk.
- Both (a) and (b)
- Only (c)
- (b), (c) and (d)
- (c), (d) and (e)
- Both (b) and (e)
Biofertilisers are organisms that enrich the nutrient quality of the soil. Which of the following microbes are used as biofertilisers?
- Bacteria
- Cyanobacteria
- Algae
- All of the above
Which of the following statements is/are false regarding methanogens (Methanobacteria)?
(a) They grow anaerobically.
(b) These bacteria are also present in the rumen of cattle.
(c) They help produce biogas.
- Only (a)
- Only (b)
- Only (c)
- None of these
- Both (a) and (b)
Treatment of waste water is done by heterotrophic microbes naturally present in the sewage. These microbes are
- the bacteria that use organic compounds as a source of energy and carbon
- the bacteria that are able to synthesise their own organic food from inorganic substances
- the bacteria that live in a mutually beneficial association with other organisms
- the bacteria that manufacture organic compounds from inorganic raw materials utilising energy liberated from the oxidation of inorganic substances
- None of these
The dough which is used for making bread, is fermented by using baker’s yeast. What is the scientific name of this yeast?
- Staphylococcus
- Penicillium notatum
- Aspergillus niger
- Saccharomyces cerevisiae
- None of these
Which of the following bacteria is used to remove clots in heart patients?
- Streptococci
- Lactobacillus
- Methanobacterium
- Anabaena
- Aspergillus
Match the following:
| 1 | Lipase | a | In bottled juices |
| 2 | Pectinase | b | To remove clots |
| 3 | Streptokinase | c | In laundry detergents |
- 1 - a, 2 - c, 3 - b
- 1 - b, 2 - c, 3 - a
- 1 - c, 2 - a, 3 - b
- 1 - c, 2 - b, 3 - a
- 1 - b, 2 - a, 3 - c
The large holes in ‘Swiss cheese’ are due to production of a large amount of CO2 by
- a bacterium named Clostridium butylicum
- a bacterium named Propionibacterium sharmanii
- a yeast named Saccharomyces cerevisiae
- a fungus called Aspegillus niger
- a bacterium named Acetobacter aceti
Which of the following is a traditional drink in some parts of southern India that is made by fermenting sap from palms?
- Lassi
- Toddy
- Green tea
- Panna
- None of these
Which of the following substances are produced by microbes to kill other disease causing microbes?
- Enzymes
- Antibiotics
- Bioactive molecules
- Chemicals
- None of these
In the secondary treatment of sewage, during digestion, bacteria produce a mixture of gases. Which of the following gases is/are not produced?
(a) methane
(b) hydrogen sulphide
(c) nitrous oxide
(d) carbon dioxide
(e) oxygen
- Only a and b
- Only c
- Only c and e
- Only b and d
- Only d and e
Which of the following is/are not a free living cyanobacteria?
(a) Nostoc
(b) Oscillatoria
(c) Anaebana
(d) Blue green algae
- Only a
- Only b
- Only c
- Only a and d
- Only b and d
Match the following microbes and their symbiont
| 1 | Micorrhiza | a | Root system of genus glomus |
| 2 | Rhizobium | b | Azolla |
| 3 | Anabaena | c | Roots of leguminous plants |
- 1 - a, 2 - b, 3 - c
- 1 - a, 2 - c, 3 - b
- 1 - c, 2 - b, 3 - a
- 1 - c, 2 - a, 3 - b
- 1 - b, 2 - c, 3 - a