Q. Which of the following is a symbiotic nitrogen fixer?
A) $Glomus$
B) $Azotobacter$
C) $Frankia$
D) $Azolla$
Explanation
$Casuarina$ tree has nitrogen fixing root nodules that harbor a filamentous streptomycete like symbiotic nitrogen fixing organism, called $Frankia$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.