Which of the following is a non–symbiotic nitrogen fixing bacteria?
1. Rhizobium
2. Mycorrhiza
3. Azotobacter
4. Nitrosomonas
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAnabaena is associated with Azolla's:
1. Stem
2. Leaves
3. Roots
4. Flowers
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyNitrogen-fixing bacteria converts:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn aquatic fern that is used to increase the yield of paddy crops:
1. Azolla
2. Salvinia
3. Marsilea
4. Isoetes
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyEnzyme first used for nitrogen fixation:
1. Nitrogenase
2. Nitroreductase
3. Transferase
4. Transaminase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich aquatic fern performs nitrogen fixation:
1. Azolla
2. Nostoc
3. Salvia
4. Salvinia
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAll 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology