Q. No.Which of the following statement is the correct about bio- fertiliser ?
1. Bacteria, fungi and cyanobacteria are major sources
2. These are ecofriendly
3. Micro- organisms involved can be symbiotic or free living.
4. All of these
Subtopic: Microbes as Biofertilizer |
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Cyanobacteria are used as biofertilizers because they:
1. Increase soil acidity for better crop yield
2. Fix atmospheric nitrogen and enrich soil fertility
3. Act as natural pesticides against pathogens
4. Help in the decomposition of organic matter
1. Increase soil acidity for better crop yield
2. Fix atmospheric nitrogen and enrich soil fertility
3. Act as natural pesticides against pathogens
4. Help in the decomposition of organic matter
Subtopic: Microbes as Biofertilizer |
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What role do cyanobacteria like Anabaena and Nostoc play in agriculture?
| 1. | They fix atmospheric nitrogen, enriching soil fertility in paddy fields. |
| 2. | They help plants absorb water more efficiently. |
| 3. | They break down toxic pesticides in the soil. |
| 4. | They act as pest repellents, protecting crops from insect damage. |
Subtopic: Microbes as Biofertilizer |
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Which of the following organism is not used in organic farming?
1. E. coli
2. Anabaena
3. Oscillatoria
4. Nostoc
Subtopic: Microbes as Biofertilizer |
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Use of some microbes as biofertiliser to enhance crop productivity is called
1. Organic farming
2. Marine farming
3. Micro farming
4. Compost farming
Subtopic: Microbes as Biofertilizer |
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Cyanobacteria, which include forms like Anabaena, Nostoc, and Oscillatoria, are autotrophic microbes found abundantly in aquatic and terrestrial habitats. In paddy fields, they serve as effective biofertilisers due to their ability to
| 1. | Increase the uptake of phosphates by rice root |
| 2. | Release growth hormones directly into the atmosphere |
| 3. | Fix atmospheric nitrogen and add organic matter to the soil |
| 4. | Improve water retention in the soil by producing mucilage |
Subtopic: Microbes as Biofertilizer |
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How do mycorrhizal fungi benefit plants in addition to enhancing phosphorus uptake?
| 1. | They help the plants absorb nitrogen directly from the air. |
| 2. | They provide resistance to root-borne pathogens, improve drought tolerance, and enhance overall plant growth. |
| 3. | They increase plant production of chlorophyll, allowing for more efficient photosynthesis. |
| 4. | They improve the plant’s ability to uptake toxic heavy metals from contaminated soils. |
Subtopic: Microbes as Biofertilizer |
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In mycorrhiza association the fungal symbiont helpful in :
1. Phosphorus nutrition
2. Resistance to root borne pathogen
3. Tolerance to salinity and drought
4. All the above
Subtopic: Microbes as Biofertilizer |
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Consider the given two statements:
| Statement I: | Mycorrhiza is a symbiotic association between a fungus and the roots of higher plants. |
| Statement II: | Plants with mycorrhizal associations show resistance to root-borne pathogens and increased tolerance to salinity and drought. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Microbes as Biofertilizer |
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| Assertion (A): | Biofertilizers are preferred over chemical fertilizers. |
| Reason (R): | Chemical fertilizers are more hazardous to the environment. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of (A) |
| 3. | (A) is True, (R) is False |
| 4. | (A) is False, (R) is True |
Subtopic: Microbes as Biofertilizer |
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