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Q. No.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
Subtopic: Microbes as Biofertilizer |
96%
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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: Microbes as Biofertilizer |
81%
From NCERT
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The biological processes performed by cyanobacteria in paddy fields include:
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
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: Microbes as Biofertilizer |
From NCERT
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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: Microbes as Biofertilizer |
85%
From NCERT
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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: Microbes as Biofertilizer |
90%
From NCERT
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Consider the given two statements:
| Assertion (A): | The use of pathogens like baculoviruses as biocontrol agent in ecologically sensitive areas should be avoided. |
| Reason (R): | Baculoviruses are broad spectrum general insecticides. |
| 1. | Both (A) and (R) are true and (R) correctly explains the (A). |
| 2. | (A) is True; (R) is False |
| 3. | (A) is False; (R) is False |
| 4. | Both (A) and (R) are True but (R) does not correctly explain the (A). |
Subtopic: Microbes in Biocontrol Agent |
69%
From NCERT
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All the following will be true for Trichoderma spp. except:
| 1. | It is being developed as a biological control agent. |
| 2. | It is a fungicide. |
| 3. | It lives in symbiosis with roots of vascular plants. |
| 4. | It is very common in the root ecosystems. |
Subtopic: Microbes in Biocontrol Agent |
From NCERT
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Bacillus thuringiensis has been used as:
1. Diazotroph
2. Bioinsecticide
3. Biofertilizer
4. Thrombolytic
1. Diazotroph
2. Bioinsecticide
3. Biofertilizer
4. Thrombolytic
Subtopic: Microbes in Biocontrol Agent |
85%
From NCERT
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Consider the given two statements:
| Assertion (A): | An important part of the biological farming approach is to become familiar with the various life forms that inhabit the field, predators as well as pests. |
| Reason (R): | This will help develop appropriate means of biocontrol. |
| 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 False |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Microbes in Biocontrol Agent |
90%
From NCERT
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Consider he two statements:
| Statement I: | The ‘conventional’ farming practices often use chemical methods which kill both useful and harmful life forms indiscriminately. |
| Statement II: | The organic farmer works to create a system where the insects that are sometimes called pests are not eradicated, but instead are kept at manageable levels. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is incorrect; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Microbes in Biocontrol Agent |
88%
From NCERT
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