Q. No.During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by
1. leghaemoglobin
2. xanthophyll
3. carotene
4. cytochrome
1. leghaemoglobin
2. xanthophyll
3. carotene
4. cytochrome
Deficiency symptoms of nitrogen and potassium are visible first in
| 1. senescent leaves | 2. young leaves |
| 3. roots | 4. buds |
The first stable product of fixation of atmospheric nitrogen in leguminous plants is
1.
2. ammonia
3.
4. glutamate
A nitrogen fixing microbe associated with Azolla in rice fields is
1. Spirulina
2. Anabaena
3. Frankia
4. Tolypothrix
Nitrifying bacteria
1. convert free nitrogen to nitrogen compounds
2. convert proteins into ammonia
3. reduce nitrates to free nitrogen
4. oxidize ammonia to nitrates
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An organism used as a biofertilizer for raising soyabean crop is
1. Azospirillum
2. Rhizobium
3. Nostoc
4. Azotobacter
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An element playing important role in nitrogen fixation is
1. molybdenum
2. copper
3. manganese
4. zinc
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The free-living, anaerobic nitrogen-fixer is
1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter
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A plant requires magnesium for
| 1. holding cells together | 2. protein synthesis |
| 3. chlorophyll synthesis | 4. cell wall development |
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