The technology of biogas production from cow dung was developed in India largely due to the efforts of:

1. Gas Authority of India
2. Oil and Natural Gas Commission
3. Indian Agricultural Research Institute and Khadi & Village Industries Commission
4. Indian Oil Corporation

Subtopic:  Microbes in Production of Biogas |
 95%
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The free-living fungus Trichoderma can be used for:

1. killing insects

2. biological control of plant diseases

3. controlling butterfly caterpillars

4. producing antibiotics

Subtopic:  Microbes in Biocontrol Agent |
 80%
From NCERT
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Mycorrhiza does not help the host plant in:

1. Enhancing its phosphorus uptake capacity
2. Increasing its tolerance to drought
3. Enhancing its resistance to root pathogens
4. Increasing its resistance to insects
Subtopic:  Microbes in Biocontrol Agent |
 70%
From NCERT
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Which one of the following is not a nitrogen-fixing organism?

1.  Anabaena 2.  Nostoc
3.  Azotobacter 4.  Pseudomonas

Subtopic:  Microbes as Biofertilizer |
 88%
From NCERT
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The residue left after methane production from cattle dung is:

1. burnt 2. buried in landfills
3. used as manure 4. used in civil construction
Subtopic:  Microbes as Biofertilizer |
 87%
From NCERT
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Methanogens do not produce:

1. oxygen 2. methane
3. hydrogen sulfide 4. carbon dioxide

Subtopic:  Microbes in Production of Biogas |
 87%
From NCERT
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What would happen if oxygen availability to activated sludge flocs is reduced?

1. It will slow down the rate of degradation of organic matter.
2. The center of flocs will become anoxic, which would cause the death of bacteria and eventually breakage of flocs.
3. Flocs would increase in size as anaerobic bacteria would grow around flocs.
4. Protozoa would grow in large numbers.
Subtopic:  Microbes in Sewage Treatment |
 50%
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During which stage of the sewage treatment are the microbes used?

1.  Primary 2.  Secondary
3.  Tertiary 4.  Quaternary
Subtopic:  Microbes in Sewage Treatment |
 91%
From NCERT
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Biogas is a mixture of:

1. Methane, Carbon dioxide, and Hydrogen sulfide
2. Methane, Carbon dioxide, and Ammonia
3. Methane, Ammonia, and Hydrogen sulfide
4. Ammonia, Carbon dioxide, and Hydrogen sulfide
Subtopic:  Microbes in Production of Biogas |
 90%
From NCERT
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‘Toddy’, a traditional drink of some parts in southern India, is made by fermenting sap from:

1. Soyabean 2. Bamboo shoots
3. Palms 4. Sugarcane
Subtopic:  Industrial Products, Beverages & Antibiotics | Chemicals, Enzymes & Other Bioactive Molecules |
 85%
From NCERT
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