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Q. No.Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilizers?
1. Aspergillus and Rhizopus
2. Rhizobium and Rhizopus
3. Cyanobacteria and Rhizobium
4. Aspergillus and Cyanobacteria
Subtopic: Â Microbes as Biofertilizer |
 80%
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NEET - 2019
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NEET 2025 - Target Batch
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Identify the incorrect statement:
| 1. | The use of the chemical fertilisers has contributed significantly to this pollution. |
| 2. | Biofertilisers are organisms that enrich the nutrient quality of the soil. |
| 3. | The main sources of biofertilisers are bacteria, fungi and cyanobacteria. |
| 4. | Chemical fertilizers are integral and essential component of organic farming. |
Subtopic: Â Microbes as Biofertilizer |
 90%
From NCERT
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Name the genus of arbuscular mycorrhizal (AM) fungi, all species of which form symbiotic
relationships (mycorrhizae) with plant roots:
1. Cercospora
2. Glomus
3. Tetraploa
4. Rozella
relationships (mycorrhizae) with plant roots:
1. Cercospora
2. Glomus
3. Tetraploa
4. Rozella
Subtopic: Â Microbes as Biofertilizer |
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A mycorrhiza is a symbiotic association between a green plant and a fungus where:
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: | The plant makes organic molecules by photosynthesis and supplies them to the fungus in the form of sugars or lipids. |
| II: | The fungus supplies the plant with water and mineral nutrients, such as phosphorus, taken from the soil. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Â Microbes as Biofertilizer |
 83%
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Bacteria that fix gaseous nitrogen in the atmosphere into a more usable form, such as ammonia,
while free-living in soil, include:
1. Only I and II
2. Only III and IV
3. Only I and III
4. Only III
while free-living in soil, include:
| I: | Azospirillum |
| II: | Azotobacter |
| III: | Rhizobia |
| IV: | Frankia |
2. Only III and IV
3. Only I and III
4. Only III
Subtopic: Â Microbes as Biofertilizer |
 85%
From NCERT
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The biological processes performed by cyanobacteria in paddy fields include:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | biological fixation of CO2. |
| II: | biological fixation of atmospheric dinitrogen. |
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Â Microbes as Biofertilizer |
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Q. No.
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