- 1(current)
Q. No.The residue left after methane production from cattle dung is:
| 1. | burnt | 2. | buried in landfills |
| 3. | used as manure | 4. | used in civil construction |
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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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What advantage does the mycobiont get in the mycorrhizal symbiotic relationship?
| 1. | Adequate uptake of water |
| 2. | More availability of minerals like phosphorus |
| 3. | Availability of carbohydrates for energy |
| 4. | Resistance to diseases, drought, and salinity |
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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 diazotroph that serves as an important biofertilizer in paddy fields is:
| 1. | Rhizobium | 2. | Frankia |
| 3. | Azotobacter | 4. | Anabaena |
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| Statement I. | Rhizobium forms symbiotic associations and forms nodules on the roots of non-leguminous plants. |
| Statement II. | Azotobacter and Azospirillum can fix atmospheric nitrogen only as symbionts. |
| Statement III. | Anabaena, Nostoc and Oscillatoria are autotrophic microbes capable of fixing atmospheric nitrogen. |
1. Only Statement I and Statement II.
2. Only Statement III.
3. Only Statement I.
4. Statement I, Statement II and Statement III.
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- 1(current)
Q. No.
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