Mycorrhiza does not help the host plant in:
1. | Enhancing its phosphorus uptake capacity |
2. | Increasing its tolerance to drought |
3. | Enhancing its resistance to root pathogens |
4. | Increasing its resistance to insects |
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Which one of the following is not a nitrogen-fixing organism?
1. | Anabaena | 2. | Nostoc |
3. | Azotobacter | 4. | Pseudomonas |
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Methanogens do not produce:
1. | oxygen | 2. | methane |
3. | hydrogen sulfide | 4. | carbon dioxide |
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During which stage of the sewage treatment are the microbes used?
1. | Primary | 2. | Secondary |
3. | Tertiary | 4. | Quaternary |
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Biogas is a mixture of:
1. Methane, Carbon dioxide, and Hydrogen sulfide
2. Methane, Carbon dioxide, and Ammonia
3. Methane, Ammonia, and Hydrogen sulfide
4. Ammonia, Carbon dioxide, and Hydrogen sulfide
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‘Toddy’, a traditional drink of some parts in southern India, is made by fermenting sap from:
1. | Soyabean | 2. | Bamboo shoots |
3. | Palms | 4. | Sugarcane |
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The ‘Roquefort cheese’ is ripened by:
1. | A fungus | 2. | A bacterium |
3. | An algae | 4. | Lichens |
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With reference to human beings, antibiotics are actually:
1. | Anti life | 2. | Pro-life |
3. | Irrelevant to life | 4. | Defining life |
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Match each item in Column I [Diazotroph] with the feature in Column II and select the correct answer from the codes given below:
|
COLUMN I |
|
COLUMN II |
A. |
Cyanobacteria |
a. |
Actinorhizal symbiont |
B. |
Frankia |
b. |
Do not form nodules |
C. |
Rhizobium |
c. |
Free-living nitrogen fixer |
D. |
Azotobacter |
d. |
Legume symbiont |
Codes
A | B | C | D | |
1. | a | b | c | d |
2. | b | a | c | d |
3. | a | b | d | c |
4. | b | a | d | c |
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The free-living fungus Trichoderma can be used for:
1. killing insects
2. biological control of plant diseases
3. controlling butterfly caterpillars
4. producing antibiotics
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