Which of the following is a non–symbiotic nitrogen fixing bacteria?
1.  Rhizobium
2.  Mycorrhiza
3.  Azotobacter
4.  Nitrosomonas

Subtopic:  Nitrogen Fixation |
 63%
From NCERT
AIPMT - 1998
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Anabaena is associated with Azolla's:
1.  Stem
2.  Leaves
3.  Roots
4.  Flowers

Subtopic:  Nitrogen Fixation |
AIPMT - 1999
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Nitrogen-fixing bacteria converts:
1. N2  NH3
2. NH4+  Nitrates
3. NO2  NO3
4. NO3  N2

Subtopic:  Nitrogen Fixation |
 71%
From NCERT
AIPMT - 1999
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An aquatic fern that is used to increase the yield of paddy crops:

1. Azolla

2. Salvinia

3. Marsilea

4. Isoetes

Subtopic:  Nitrogen Fixation |
 85%
AIPMT - 2000
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Enzyme first used for nitrogen fixation:
1.  Nitrogenase
2.  Nitroreductase
3.  Transferase
4.  Transaminase

Subtopic:  Nitrogen Fixation |
 93%
From NCERT
AIPMT - 2001
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Which aquatic fern performs nitrogen fixation:
1.  Azolla
2.  Nostoc
3.  Salvia
4.  Salvinia

Subtopic:  Nitrogen Fixation |
 86%
AIPMT - 2001
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If by radiation all nitrogenase enzymes are inactivated, then there will be no:
1. Fixation of atmospheric nitrogen
2. Conversion from nitrate to nitrite in legumes
3. Conversion from ammonium to nitrate in soil
4. Fixation of nitrogen in legumes

Subtopic:  Nitrogen Fixation |
From NCERT
AIPMT - 2004
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All of the following statements concerning the Actinomycetous filamentous soil bacterium Frankia are correct EXCEPT that Frankia:
 

1. Forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids
2. Can induce root nodules on many plant species
3. Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex
4. Cannot fix nitrogen in the free-living state
Subtopic:  Nitrogen Fixation |
From NCERT
AIPMT - 2005
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NEET 2023 - Target Batch - Aryan Raj Singh