Alnus plant has symbiotic association with which of these nitrogen fixing bacteria?
A
Rhodospirillum
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B
Azospirillum
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C
Rhizobium
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D
Frankia
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Solution
The correct option is D Frankia
Frankia alni is a Gram-positive species of actinomycete filamentous bacterium that lives in symbiosis with actinorhizal plants in the genus Alnus. So the correct option is 'Frankia'.