Which one of the following is not a nitrogen-fixing organism?
1. | Anabaena | 2. | Nostoc |
3. | Azotobacter | 4. | Pseudomonas |
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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 |
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Methanogens do not produce:
1. | oxygen | 2. | methane |
3. | hydrogen sulfide | 4. | carbon dioxide |
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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. |
During which stage of the sewage treatment are the microbes used?
1. | Primary | 2. | Secondary |
3. | Tertiary | 4. | Quaternary |
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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
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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 |
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The ‘Roquefort cheese’ is ripened by:
1. | A fungus | 2. | A bacterium |
3. | An algae | 4. | Lichens |
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With reference to human beings, antibiotics are actually:
1. | Anti life | 2. | Pro-life |
3. | Irrelevant to life | 4. | Defining life |
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Which of the following human diseases cannot be treated by antibiotics?
1. | Plague | 2. | Diphtheria |
3. | Leprosy | 4. | Mumps |
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