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Q. No.Assertion: All nitrogen fixing organisms are bacteria.
Reason: Only bacteria can have mutualistic relationship with roots of plants.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
With regard to the Biological Nitrogen Fixation by Rhizobium in association with soyabean, which one of the following statement/statements does not hold true?
1. Nitrogenase may require oxygen for its functioning .
2. Nitrogenase is MO-Fe protein.
3. Leg-hemoglobin is a pink coloured pigment.
4. Nitrogenase helps to convert gas into two molecules of ammonia.
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With respect to symbiotic relationships of plants, consider the following two statements:
I. Plants acquire most of their nitrogen in the form of N2 that they obtain from rhizobacteria.
II. The fungal hyphae of both ectomycorrhizae and arbuscular mycorrhizae absorb water and minerals, which they supply to their plant hosts.
| 1. Only I is true | 2. Only II is true |
| 3. Both I and II are true | 4. Both I and II are false |
Identify a free living anaerobic nitrogen fixing microbe:
| 1. Azotobacter | 2. Beijernickia |
| 3. Nostoc | 4. Rhodospirillum |
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Name the amino acid from which 17 other amino acids are formed by transamination in plants?
| 1. Glycine | 2. Lysine |
| 3. Tryptophan | 4. Glutamic acid |
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| A. Industrial nitrogen fixation B. Electrical nitrogen fixation C. Denitrification D. Ammonification |
 |
| I | II | III | IV | |
| 1. | A | B | C | D |
| 2. | B | A | C | D |
| 3. | A | B | D | C |
| 4. | B | A | D | C |
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| 1. | in the roots of non-leguminous plants like Alnus but unlike Rhizobium does not form any root nodules |
| 2. | in the roots of leguminous plants like Soybean but unlike Rhizobium does not form any root nodules |
| 3. | in the roots of non-leguminous plants like Alnus and like Rhizobium forms root nodules |
| 4. | in the roots of leguminous plants like Soybean and like Rhizobium forms root nodules |
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Q. No.
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