Q. Name the Nitrogen fixing bacteria found in the roots of leguminous plants .

A
Azospirillum
B
Rhizobium
C
Azotobacter
D
Nostoc
Solution:

Rhizobia are bacteria that fix nitrogen (diazotrophs) after becoming established inside root nodules of legumes (Fabaceae). To express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen. In general, they are Gram-negative, motile, non-sporulating rods

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