Q. A prokaryotic autotrophic nitrogen fixing symbiont is found in
A) Pisum
B) Alnus
C) Cycas
D) Cicer
Explanation
[Solution from source] The coralloid roots of Cycas harbour cyanobacteria such as Anabaena, which are prokaryotic, photoautotrophic and fix nitrogen. Pisum, Cicer and Alnus have nitrogen-fixing symbionts too (Rhizobium, Frankia), but these are not autotrophic. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.