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Which one of the following produces nitrogen fixing nodules on the roots of Alnus?
Option: 1
Frankia
Option: 2
Rhodospirillum
Option: 3
Beijernickia
Option: 4
Rhizobium
Answers (1)
Frankia - produces nitrogen-fixing nodules on the roots of the non-leguminous plants (e.g., Alnus)
Beijerinckia & Rhodospirillum - Free-living nitrogen fixing aerobic microbes
Rhizobium - Free-living in soil, but as symbionts can fix atmospheric nitrogen in the roots of the leguminous plants.
Hence the correct option is (a)
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