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Mycorrhizal symbiotic fungi in plant roots primarily help in:
1. Nitrogen fixation
2. Phosphate absorption
3. Photosynthesis
4. Bicontrol
1. Nitrogen fixation
2. Phosphate absorption
3. Photosynthesis
4. Bicontrol
Subtopic: Microbes as Biofertilizer |
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Level 2: 60%+
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Consider the two statements:
| Assertion (A): | Use of chemical fertilisers in agriculture worldwide should be avoided. |
| Reason (R): | Chemical fertilisers, contrary to popular belief, are ineffective and do not add any nutrients to the soil. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True; (R) is False. |
| 3. | (A) is False; (R) is True. |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Microbes as Biofertilizer |
61%
Level 2: 60%+
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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 |
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Which of the following microbes, capable of fixing atmospheric nitrogen, is an important biofertilizer in paddy fields?
1. Rhizobium
2. Frankia
3. Azotobacter
4. Anabaena
Subtopic: Microbes as Biofertilizer |
59%
Level 3: 35%-60%
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Consider the following statements regarding biofertilisers:
Which of the above statement(s) is/are correct?
1. (a) only
2. (b) only
3. Both (a) and (b)
4. Neither (a) nor (b)
| (a) | Rhizobium forms a symbiotic association with leguminous plants and helps in fixing atmospheric nitrogen into organic forms, benefiting the plant. |
| (b) | Azospirillum and Azotobacter are examples of symbiotic nitrogen-fixing bacteria that enrich soil nitrogen content. |
1. (a) only
2. (b) only
3. Both (a) and (b)
4. Neither (a) nor (b)
Subtopic: Microbes as Biofertilizer |
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Subtopic: Microbes as Biofertilizer |
56%
Level 3: 35%-60%
AIPMT - 1999
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