Microbes in Human Welfare Chapter-Wise Test 13

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following plays an essential role in reducing pollution by breaking down organic waste?

Microbes
Heavy metals
Synthetic polymers
Pesticides
1

Microbes play a major role in decomposing organic waste, reducing pollution naturally.

Which microbial biofertilizer is commonly used for non-leguminous plants?

Rhizobium
Azospirillum
Glomus
Nostoc
2

Azospirillum is a free-living nitrogen-fixing bacterium that improves soil fertility for non-leguminous plants.

Which of the following processes uses microbial action to remove organic matter from sewage?

Sedimentation
Filtration
Biological treatment
Coagulation
3

Biological treatment in sewage plants uses microbes to degrade organic waste.

Which of the following microbial enzymes is used to clarify fruit juices?

Lipase
Pectinase
Protease
Amylase
2

Pectinase breaks down pectin, helping to clarify fruit juices.

Which of the following processes helps in the removal of small debris from sewage water?

Secondary treatment
Tertiary treatment
Primary treatment
Anaerobic digestion
3

Primary treatment involves sedimentation and filtration to remove solid particles from sewage.

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 Bt toxin in an inactive form, which becomes active inside the insect's gut.

Which of the following microbial processes results in the production of methane in biogas plants?

Fermentation
Methanogenesis
Photosynthesis
Nitrification
2

Methanogenesis is the process by which methanogenic bacteria produce methane in biogas plants.

Which microorganism is used in the fermentation of soybeans to produce tempeh?

Rhizopus
Saccharomyces cerevisiae
Lactobacillus
Aspergillus
1

Rhizopus is used in the fermentation of soybeans to produce tempeh, a traditional fermented food.

Which of the following is an example of a biofertilizer that enriches soil nitrogen content?

Aspergillus
Nostoc
Saccharomyces
Penicillium
2

Nostoc, a nitrogen-fixing cyanobacterium, improves soil fertility by fixing atmospheric nitrogen.

Which of the following organisms is a major component of biofertilizers in agriculture?

Penicillium
Saccharomyces
Rhizobium
Streptococcus
3

Rhizobium forms root nodules in legumes and fixes atmospheric nitrogen, improving soil fertility.

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