Which of the following is a symbiotic nitrogen fixing bacteria?

Azolla

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Glomus

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Azotobacter

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Frankia

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Solution

The correct option is D
Frankia

Frankia is a genus of nitrogen fixing filamentous bacteria that lives in symbiosis with actinorhizal plants, similar to the Rhizobia bacteria that are found in the root nodules of legumes in the Fabaceae family. Azolla is a water fern, a plant that is in a symbiotic association with the cyanobacterium anabaena which fixes atmospheric nitrogen. Glomus is a fungal species in symbiotic association with the roots of specific plants. Azotobacter is a free living soil nitrogen fixer.

Suggest Corrections

	List I		List II
A	$A z o s p i r i l l u m$ and $A z o t o b a c t e r$	1	Free living nitrogen fixing bacteria
B	$G l o m u s$	2	Biological control tools
C	$A n a b a e n a$ and $N o s t o c$	3	Forms mycorrhiza
D	$N u c l e o p o l y h e d r o$ $v i r u s$	4	Symbiotic cyanobacteria