Stem nodulating Rhizobium species is

A. Sino-rhizobium

B. Bradyrhizobium

C. Azo-rhizobium

D. All of these

Answer: Option C

Solution(By Examveda Team)

Stem nodulating Rhizobium species is Azo-rhizobium. It belongs to the genus of Gram-negative soil bacteria. Like root nodulating bacteria they fix nitrogen in symbiosis with plants in the genus sesbania.
Stem nodules occur at the site of adventitious root primordia located on the stems via crack entry.