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Q. No.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
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:
| Assertion (A): | The use of biofertilizers is encouraged in sustainable agriculture to reduce chemical input. |
| Reason (R): | Biofertilizers such as Rhizobium fix atmospheric nitrogen but they also cause several adverse effects on the environment. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Microbes as Biofertilizer |
82%
From NCERT
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Match the microbial processes in Column I with their primary benefits or products in Column II.
1. A-3, B-1, C-4, D-2
2. A-1, B-2, C-4, D-3
3. A-2, B-4, C-1, D-3
4. A-4, B-3, C-2, D-1
| Column I | Column II | ||
| A | Anaerobic digestion | 1 | Cleaning up oil spills |
| B | Fermentation by yeast | 2 | Enhancement of soil fertility |
| C | Nitrogen fixation by legume symbionts | 3 | Production of alcoholic beverages |
| D | Bioremediation by Pseudomonas | 4 | Generation of biogas |
1. A-3, B-1, C-4, D-2
2. A-1, B-2, C-4, D-3
3. A-2, B-4, C-1, D-3
4. A-4, B-3, C-2, D-1
Subtopic: Industrial Products, Beverages & Antibiotics | Microbes in Production of Biogas | Microbes as Biofertilizer |
97%
From NCERT
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Consider the given two statements:
| Assertion (A): | Using microbes for the production of industrial products such as enzymes and pharmaceuticals is often more desirable than purely chemical methods. |
| Reason (R): | Microbial production methods can be more environmentally friendly, cost-effective, and can produce substances with higher specificity and lower by-products compared to traditional chemical synthesis. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True and (R) does not correctly explain (A) |
| 3. | (A) is True; (R) is False |
| 4. | (A) is False; (R) is True |
Subtopic: Chemicals, Enzymes & Other Bioactive Molecules |
92%
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What is the correct statement about the contributions of Alexander Fleming and Florey and Chain in the discovery and development of penicillin?
| 1. | Fleming discovered penicillin, and Florey and Chain developed the extraction and purification methods to produce it as a drug. |
| 2. | Fleming developed the extraction methods, and Florey and Chain discovered penicillin. |
| 3. | Florey and Chain discovered penicillin, and Fleming developed its commercial production. |
| 4. | Fleming, Florey, and Chain all simultaneously discovered penicillin. |
Subtopic: Industrial Products, Beverages & Antibiotics |
92%
From NCERT
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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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