Microbes in Human Welfare
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the role of Baculoviruses in pest control?

They kill mosquito larvae
They attack insects and arthropods
They fix nitrogen in soil
They help in sewage treatment
2

Baculoviruses, particularly in the genus Nucleopolyhedrovirus, are used for biological pest control.

Which of the following is used in sewage treatment to reduce Biochemical Oxygen Demand (BOD)?

Fungi
Methanogens
Aerobic bacteria
Protozoa
3

Aerobic bacteria in sewage treatment plants help degrade organic matter, reducing BOD.

Which gas is a major component of biogas?

Carbon dioxide
Methane
Oxygen
Hydrogen
2

Methane is the major component of biogas, produced by methanogenic bacteria.

Which of the following statements about microbes in industrial production is correct?

Saccharomyces cerevisiae is used in ethanol production.
Lactobacillus is used in beer production.
Aspergillus niger is used to produce acetic acid.
Rhizobium is used in antibiotic production.
1

Saccharomyces cerevisiae (brewer’s yeast) is used for fermenting sugars to produce ethanol.

Which of the following statements about sewage treatment is incorrect?

Primary treatment removes suspended solids.
Aerobic bacteria are used in secondary treatment.
Methanogens are involved in secondary treatment.
Activated sludge is used in further treatment processes.
3

Methanogens are involved in anaerobic sludge digestion, not secondary treatment.

Which of the following statements regarding biocontrol agents is correct?

Trichoderma is used as a biocontrol agent against plant pathogens.
Bacillus thuringiensis affects plant roots.
Pseudomonas is used in nitrogen fixation.
Biofertilizers and biopesticides function in the same way.
1

Trichoderma species are fungal biocontrol agents used against soil-borne plant pathogens.

Which of the following statements regarding biogas production is incorrect?

Methanogens are responsible for methane production.
Biogas plants work only in the presence of oxygen.
Biogas contains methane and carbon dioxide.
Anaerobic bacteria play a major role in biogas production.
2

Biogas production is an anaerobic process and does not require oxygen.

Which of the following microbes is commonly found in the rumen of cattle?

Clostridium
Methanobacterium
Streptococcus
Bacillus
2

Methanobacterium helps in the breakdown of cellulose in the rumen of cattle.

Which of the following is used in the fermentation of idli and dosa batter?

Aspergillus
Rhizobium
Lactic acid bacteria
Saccharomyces cerevisiae
3

Lactic acid bacteria ferment the batter, producing CO₂ that makes it fluffy.

Which microorganism is used in the production of bioactive molecule Streptokinase?

Streptococcus
Bacillus
Pseudomonas
Saccharomyces
1

Streptococcus produces Streptokinase, which is used as a clot-busting drug.

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