Question

Biofertiliser for Soya bean crop is

• A. Rhizobium
• B. Nostoc
• C. Azotobacter
• D. Azospirillum

Answer 1

The correct option is A Rhizobium

(A)Rhizobia are bacteria that fix nitrogen after becoming established inside root nodules of legume. It is a biofertilizer for soya bean crop.

(B)Nostoc is a genus of cyanobacterium found in the environment that forms colonies composed of filaments in a gelatinous sheath.

(C)Azobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime.

(D)Azospirillium is a gram-negative microaerophilic and nitrogen-fixing bacteria.

So, the correct option is 'Rhizobium'.