Which of the following is not a symbiotic nitrogen fixer?

Streptomyces

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Anabaena

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Frankia

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Rhizobium

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Solution

The correct option is A Streptomyces
Anabena is nitrogen-fixing cyanobacteria, which forms a symbiotic relationship with Azola (fern) and Frankia is filamentous bacteria, which forms a symbiotic relationship with the actinorhizal plant. Rhizobium lives as a symbiont in roots of legumes. Streptomyces are the member of Actinomycetes family and they mainly inhabit the soil. Because of this, they are mainly phytopathogen.

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