Which one of the following produces nitrogen fixing nodules on the roots of Alnus ??
1. Beijernickia
2. Rhizobium
3. Frankia
4. Rhodospirillum
Subtopic:  Genetics & Biochemistry of Nitrogen Fixation |
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Which of the following is a symbiotic nitrogen fixer?
1. Glomus
2. Azotobacter
3. Frankia
4. Azolla

Subtopic:  Nitrogen Fixation | Genetics & Biochemistry of Nitrogen Fixation |
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Nitrogen-fixation in root nodules of Alnus is brought about by:
1. Bradyrhizobium 2. Clostridium
3. Frankia 4. Azorhizobium
Subtopic:  Nitrogen Fixation | Genetics & Biochemistry of Nitrogen Fixation |
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