During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by
1. leghaemoglobin
2. xanthophyll
3. carotene
4. cytochrome

Subtopic:  Nodule formation |
 90%
From NCERT
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Deficiency symptoms of nitrogen and potassium are visible first in

1. senescent leaves 2. young leaves
3. roots 4. buds
Subtopic:  Mineral Deficiency & Toxicity |
 77%
From NCERT
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The first stable product of fixation of atmospheric nitrogen in leguminous plants is
1. NO2-
2. ammonia
3. NO3-
4. glutamate

Subtopic:  Nitrogen Fixation | Nodule formation |
 70%
From NCERT
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A nitrogen fixing microbe associated with Azolla in rice fields is
1. Spirulina
2. Anabaena
3. Frankia
4. Tolypothrix

Subtopic:  Nitrogen Fixation |
 70%
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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

Subtopic:  Ammonia Assimilation & Nitrogen Export |
 59%
From NCERT
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An organism used as a biofertilizer for raising soyabean crop is
1. Azospirillum
2. Rhizobium
3. Nostoc
4. Azotobacter

Subtopic:  Microbes as Biofertilizer |
 69%
From NCERT
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An element playing important role in nitrogen fixation is
1. molybdenum
2. copper
3. manganese
4. zinc

Subtopic:  Mineral Function |
 79%
From NCERT
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Which one of the following is not a micronutrient?
1. Molybdenum
2. Magnesium
3. Zinc
4. Boron

Subtopic:  Classification of Nutrients |
 86%
From NCERT
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The free-living, anaerobic nitrogen-fixer is
1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter

Subtopic:  Nitrogen Fixation |
 71%
From NCERT
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A plant requires magnesium for

1. holding cells together 2. protein synthesis
3. chlorophyll synthesis 4. cell wall development
Subtopic:  Mineral Function |
 87%
From NCERT
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