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Q. No.Subtopic: Microbes as Biofertilizer |
82%
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The figure shows mycorrhiza [white threads] in rhizosphere. Identify the correct statements regarding this mutualist symbiotic relationship:
| Statement I: | The plant makes organic molecules such as sugars by photosynthesis and supplies them to the fungus. The fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil. |
| Statement II: | Mycorrhizal plants are often more resistant to diseases, such as those caused by microbial soil-borne pathogens. |
| 1. | Statement I is correct but Statement II is incorrect |
| 2. | Statement I is incorrect but Statement II is correct |
| 3. | Statement I is correct and Statement II is correct |
| 4. | Statement I is incorrect and Statement II is incorrect |
Subtopic: Microbes as Biofertilizer |
87%
From NCERT
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Arbuscular mycorrhizas are formed only by fungi in the division:
| 1. | Ascomycota | 2. | Glomeromycota |
| 3. | Basidiomycota | 4. | Microsporidia |
Subtopic: Microbes as Biofertilizer |
56%
The figure shows Azolla [mosquito fern, duckweed fern, fairy moss, water fern]. The plant is ecologically important because:
| Statement I: | They form a symbiotic relationship with the cyanobacterium Anabaena azollae. |
| Statement II: | Anabaena azollae is an extracellular endosymbiont (living outside the host's cells) which fixes atmospheric nitrogen. |
| 1. | Statement I is correct but Statement II is incorrect |
| 2. | Statement I is incorrect but Statement II is correct |
| 3. | Statement I is correct and Statement II is correct |
| 4. | Statement I is incorrect and Statement II is incorrect |
Subtopic: Microbes as Biofertilizer |
78%
In paddy fields, important biofertilizers are:
| 1. | Cyanobacteria | 2. | Rhizobium |
| 3. | Frankia | 4. | Glomus |
Subtopic: Microbes as Biofertilizer |
71%
From NCERT
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In contrast to Rhizobium species, Azotobacter species are:
1. lacking nitrogenase
2. free-living, nitrogen-fixing bacteria
3. obligate symbionts
4. Gram-positive bacteria
1. lacking nitrogenase
2. free-living, nitrogen-fixing bacteria
3. obligate symbionts
4. Gram-positive bacteria
Subtopic: Microbes as Biofertilizer |
89%
From NCERT
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Consider the given two statements:
I. Glomus species cannot be cultured in the laboratory in the absence of a plant host.
II. Glomus species form symbiotic relationships (mycorrhizae) with plant roots.
1. Both I and Ii are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is incorrect but II is correct
4. I is correct but II is incorrect
I. Glomus species cannot be cultured in the laboratory in the absence of a plant host.
II. Glomus species form symbiotic relationships (mycorrhizae) with plant roots.
1. Both I and Ii are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is incorrect but II is correct
4. I is correct but II is incorrect
Subtopic: Microbes as Biofertilizer |
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In biological nitrogen fixation by microbes:
I. Rhizobium fixes nitrogen in the root nodules of leguminous plants
II. Frankia fixes nitrogen in the root nodules of non-leguminous [actinorrhizal] plants
III. Mycorrhiza are symbiotic relation between vascular plants and fungi [genus Glomus] that help plants absorb minerals like phosphorus
IV. Cyanobacteria [Anabaena, Nostoc and Oscillatoria] serve as important biofertlizers in paddy fields
1. Only I, II and III are correct
2. Only I, II and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
I. Rhizobium fixes nitrogen in the root nodules of leguminous plants
II. Frankia fixes nitrogen in the root nodules of non-leguminous [actinorrhizal] plants
III. Mycorrhiza are symbiotic relation between vascular plants and fungi [genus Glomus] that help plants absorb minerals like phosphorus
IV. Cyanobacteria [Anabaena, Nostoc and Oscillatoria] serve as important biofertlizers in paddy fields
1. Only I, II and III are correct
2. Only I, II and IV are correct
3. Only II, III and IV are correct
4. I, II, III and IV are correct
Subtopic: Microbes as Biofertilizer |
77%
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