Which one of the following produces nitrogen fixing nodules on the roots of Alnus?
(1) Beijerinckia

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Question

Which one of the following produces nitrogen fixing nodules on the roots of Alnus?
(1) Beijerinckia (2) Rhizobium (3) Frankia (4) Rhodospirillum

Accepted Answer

Correct Answer: C — FrankiaStep-by-step Solution:Frankia is a filamentous, gram-positive actinomycete that forms symbiotic nitrogen-fixing root nodules on non-leguminous plants such as Alnus (alder), Casuarina, and Myrica. It fixes atmospheric nitrogen through the enzyme nitrogenase, similar to Rhizobium.Why other options are wrong:Rhizobium — forms nodules on leguminous plants only (e.g., pea, bean, soybean); not on Alnus.Beijerinckia — a free-living, aerobic nitrogen-fixing bacterium found in soil; does not form nodules.Rhodospirillum — a free-living, photosynthetic (purple non-sulphur), nitrogen-fixing bacterium; does not form nodules.Key Concept: Symbiotic nitrogen fixation — Rhizobium with legumes; Frankia with non-leguminous plants (actinorhizal plants). Free-living nitrogen fixers — Azotobacter, Beijerinckia (aerobic); Clostridium (anaerobic); Rhodospirillum (anaerobic, photosynthetic).

Which one of the following produces nitrogen fixing nodules on the roots of Alnus? (1) Beijerinckia (2) Rhizobium (3) Frankia (4) Rhodospirillum

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Which one of the following produces nitrogen fixing nodules on the roots of Alnus? (1) Beijerinckia (2) Rhizobium (3) Frankia (4) Rhodospirillum

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