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Q. No.If oxygen availability to activated sludge flocs in a sewage treatment plant is reduced:
1.
the rate of degradation of organic matter slows down
2.
the center of flocs becomes anoxic, causing death of bacteria and eventually breakage of flocs.
3.
the flocs would increase in size as anaerobic bacteria would grow around flocs.
4.
Protozoa would grow in large numbers.
Subtopic: Microbes in Sewage Treatment |
From NCERT
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The technology of biogas production from cow dung was developed in India largely due to the efforts of:
| 1. | Indian Renewable Energy Development Agency Limited |
| 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 |
98%
From NCERT
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Methanogenic bacteria are found in:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | rumen of cattle | II: | activated sludge |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Microbes in Production of Biogas |
66%
From NCERT
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All the following are benefits of mycorrhizal association to vascular plants except:
1. Increasing its tolerance to drought
2. Enhancing its resistance to root pathogens
3. Enhancing its phosphorus uptake capacity
4. Biological nitrogen fixation
1. Increasing its tolerance to drought
2. Enhancing its resistance to root pathogens
3. Enhancing its phosphorus uptake capacity
4. Biological nitrogen fixation
Subtopic: Microbes as Biofertilizer |
63%
From NCERT
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Consider the give statements:
1. Only I and II are correct
2. Only II and III are correct
3. Only I and III are correct
4. I, II and III are correct
| I: | Wine and beer are produced without distillation. |
| II: | Whiskey, brandy and rum are produced by distillation. |
| III: | Toddy is a traditional alcoholic beverage from South India produced by fermenting palm tree sap. |
2. Only II and III are correct
3. Only I and III are correct
4. I, II and III are correct
Subtopic: Industrial Products, Beverages & Antibiotics |
90%
From NCERT
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Cyanobacteria:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | serve as important biofertilizers in paddy fields. |
| II: | add organic matter to the soil to increase its fertility. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Microbes as Biofertilizer |
85%
From NCERT
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Consider the given two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Yeast (Saccharomyces cerevisiae) is used for commercial production of ethanol. |
| II: | Statins are produced by the yeast Monascus purpureus |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules |
91%
From NCERT
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The large holes in the cheese shown below is due to fermentation carried out by:
1. Penicillium
2. Propionibacterium
3. Saccharomyces
4. Streptomyces
1. Penicillium
2. Propionibacterium
3. Saccharomyces
4. Streptomyces
Subtopic: Microbes in Household Products |
86%
From NCERT
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A small part of the activated sludge in sewage treatment plant is:
| 1. | pumped back into the aeration tank to serve as the inoculum. |
| 2. | added to the fresh water rivers. |
| 3. | is used to produce probiotics. |
| 4. | pumped into large tanks called anaerobic sludge digesters. |
Subtopic: Microbes in Sewage Treatment |
92%
From NCERT
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Treatment of waste-water is done by the:
| 1. | heterotrophic microbes naturally present in the sewage. |
| 2. | photosynthetic autotrophic microbes naturally present in the sewage. |
| 3. | methanogens. |
| 4. | anaerobic microbes added as inoculum. |
Subtopic: Microbes in Sewage Treatment |
70%
From NCERT
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