Q. No.In the given diagram, the gas X can be:
1.
Hydrogen sulfide
2.
Carbon monoxide
3.
Ammonia
4.
Oxygen
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The rising of dough is due to:
1. Multiplication of yeast
2. Production of CO2
3. Emulsification
4. Hydrolysis of wheat flour starch into sugars
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Methanogenic bacteria are not found in:
1. rumen of cattle
2. gobar gas plant
3. bottom of water-logged paddy fields
4. activated sludge
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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
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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 |
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Which one of the following is not a nitrogen-fixing organism?
| 1. | Anabaena | 2. | Nostoc |
| 3. | Azotobacter | 4. | Pseudomonas |
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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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