Q. An organism used as biofertilizer for raising soyabean crop is
A) Nostoc
B) Azotobacter
C) Azospirillum
D) Rhizobium
Explanation
[Solution from source] Soyabean is a legume, and Rhizobium forms root nodules on legumes and fixes atmospheric nitrogen symbiotically. Azotobacter and Azospirillum are free-living or associative fixers, and Nostoc is a cyanobacterium used for paddy fields. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.