Microbes in Human Welfare Chapter-Wise Test 14

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following microbes is commonly used for the biological control of soil-borne fungal pathogens?

Bacillus thuringiensis
Trichoderma
Azotobacter
Pseudomonas
2

Trichoderma is a fungus that acts as a biocontrol agent against soil-borne fungal pathogens.

Which of the following statements about sewage treatment is incorrect?

Primary treatment removes large and suspended solids.
Secondary treatment involves aerobic microbes.
Sludge digestion is carried out by aerobic bacteria.
Tertiary treatment involves chemical and physical processes.
3

Sludge digestion is carried out by anaerobic bacteria, not aerobic bacteria.

Which bacteria are primarily responsible for nitrogen fixation in leguminous plants?

Azotobacter
Rhizobium
Pseudomonas
Bacillus
2

Rhizobium forms symbiotic relationships with leguminous plants and helps in nitrogen fixation.

Which of the following microbes is used in the fermentation of dairy products like yogurt?

Saccharomyces cerevisiae
Lactobacillus
Rhizobium
Clostridium
2

Lactobacillus ferments lactose in milk to produce lactic acid, which is essential for making yogurt.

Which of the following is a key function of microbes in waste management?

Increasing air pollution
Decomposing organic matter
Producing chemical pesticides
Generating radioactive waste
2

Microbes play a key role in breaking down organic matter, which helps in waste management and recycling nutrients.

Which microorganism is used in the production of ethanol for industrial purposes?

Lactobacillus
Saccharomyces cerevisiae
Pseudomonas
Clostridium
2

Saccharomyces cerevisiae (yeast) ferments sugars to produce ethanol, which is used in industrial applications.

Which of the following is the main advantage of biofertilizers over chemical fertilizers?

They provide immediate nutrients
They are cheap and eco-friendly
They kill pests
They are produced synthetically
2

Biofertilizers are cost-effective, sustainable, and improve soil fertility without harming the environment.

Which of the following statements about Bt toxin is incorrect?

Bt toxin is produced by Bacillus thuringiensis.
Bt toxin is active inside bacterial cells.
Bt toxin is used in genetically modified crops.
Bt toxin becomes active in the alkaline gut of insects.
2

Bacillus thuringiensis produces an inactive form of Bt toxin that becomes active in the insect's alkaline gut.

Which bioactive molecule is used to dissolve blood clots?

Penicillin
Statins
Cyclosporin A
Streptokinase
4

Streptokinase, produced by *Streptococcus*, is used as a clot-dissolving agent in medicine.

Which of the following microbes is commonly used in the fermentation of fish and bamboo shoots?

Saccharomyces
Lactobacillus
Clostridium
Streptococcus
2

Lactobacillus is commonly used in the fermentation of fish and bamboo shoots to enhance flavor and preservation.

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