The first stable product of fixation of atmospheric nitrogen in leguminous plants is

1. NO2-

2. ammonia

3. NO3-

4. glutamate

Subtopic:  Ammonia Assimilation & Nitrogen Export |
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Best defined function of manganese in green plants is

1. photolysis of water

2. Calvin cycle

3. nitrogen fixation

4. water absorption

Subtopic:  Mineral Function |
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Which one of the following is wrong statement?

1. Anabaena and Nostoc are capable of fixing nitrogen in free-living state also

2. Root nodule forming nirogen fixers live as aerobes under free-living conditions

3. Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins

4. Nitrosomonas and Nitrobacter are chemoautotrophs

Subtopic:  Nitrogen Fixation |
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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 |
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The function of leghaemoglobin in the root nodules of legumes is 

(1) oxygen removal

(2) nodule differentiation

(3) expression of nif gene

(4) inhibition of nitrogenase activity

Subtopic:  Nitrogen Fixation | Nodule formation |
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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:  Nitrogen Fixation |
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An organism used as a biofertilizer for raising soyabean crop is

1. Azospirillum

2. Rhizobium

3. Nostoc

4. Azotobacter

Subtopic:  Nitrogen Fixation |
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An element playing important role in nitrogen fixation is

1. molybdenum

2. copper

3. manganese

4. zinc

Subtopic:  Nitrogen Fixation |
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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 |
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The free-living, anaerobic nitrogen-fixer is

1. Beijerinckia

2. Rhodospirillum

3. Rhizobium

4. Azotobacter

Subtopic:  Nitrogen Fixation |
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