Microbes in Human Welfare Chapter-Wise Test 17

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following microbes is used in the production of biogas?

Methanobacterium
Saccharomyces
Rhizobium
Pseudomonas
1

Methanobacterium is a methanogenic bacterium responsible for methane production in biogas plants.

Which of the following statements about sewage treatment is incorrect?

Primary treatment removes physical impurities.
Secondary treatment involves aerobic bacteria.
Methanogens are involved in secondary treatment.
Tertiary treatment involves chemical purification.
3

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

Which of the following is used in the clarification of fruit juices?

Lipase
Pectinase
Streptokinase
Cellulase
2

Pectinase is used in the food industry to break down pectin, making fruit juices clearer.

Which of the following statements about Bt toxin is correct?

Bt toxin is produced by Bacillus thuringiensis.
Bt toxin harms all living organisms.
Bt toxin remains active inside bacterial cells.
Bt crops do not produce Bt toxin.
1

Bacillus thuringiensis produces Bt toxin, which is used in genetically modified crops for insect resistance.

Which of the following microbes is commonly used for ethanol production?

Pseudomonas
Saccharomyces cerevisiae
Rhizopus
Penicillium
2

Saccharomyces cerevisiae (yeast) is used in the fermentation of sugar to produce ethanol.

Which of the following is an example of a bacterium used in the biocontrol of caterpillars?

Bacillus thuringiensis
Rhizobium
Escherichia coli
Lactobacillus
1

Bacillus thuringiensis produces toxins that kill caterpillars and is used as a biopesticide.

Which of the following microbes is used for the commercial production of butanol?

Saccharomyces cerevisiae
Acetobacter aceti
Clostridium butylicum
Pseudomonas
3

Clostridium butylicum is used in the industrial production of butanol through fermentation.

Which of the following statements regarding biogas production is incorrect?

Methanogens play a key role in biogas production.
Biogas is produced through aerobic fermentation.
Methane is a major component of biogas.
Biogas plants work under anaerobic conditions.
2

Biogas production is an anaerobic process, not aerobic.

Which of the following microbes is commonly used in the bioremediation of oil spills?

Pseudomonas
Lactobacillus
Rhizobium
Saccharomyces
1

Pseudomonas species can degrade petroleum and are used in the bioremediation of oil spills.

Which of the following microbes is used for the production of citric acid?

Aspergillus niger
Saccharomyces cerevisiae
Pseudomonas
Clostridium
1

Aspergillus niger is used in the large-scale production of citric acid.

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