Q. Nitrogen fixation in root nodules of Alnus is brought about by
A) Azorhizobium
B) Bradyrhizobium
C) Clostridium
D) Frankia
Explanation
[Solution from source] Non-leguminous Alnus forms root nodules with Frankia, a nitrogen-fixing actinomycete. Rhizobium-group bacteria such as Bradyrhizobium nodulate legumes, and Clostridium is a free-living anaerobic fixer. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.