Q.

Rhizobium is a kind of –

A. Photosynthetic bacteria
B. Symbiotic bacteria
C. Parasitic bacteria
D. Saprophytic bacteria
Answer» B. Symbiotic bacteria
Explanation: Rhizobia are soil bacteria that fix nitrogen after becoming established inside root nodules of legumes. They are the only nitrogen- fixing bacteria living in a symbiotic relationship with legumes. Common crop and forage legumes are peas, beans, clover, and soy.
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