Q. Which one of the following plants functions as symbolic nitrogen-fixing plant?
A) $Azolla$
B) $Cycas$
C) Moss
D) $Marchantia$
Explanation
$Azolla$ is an aquatic fen with bilobed leaves. It encloses large mucilage cavity, which contain filaments of $Anabaena\ azollae.\ \ Anabaena$ fixes nitrogen from air into nitrogenous compounds, which accumulate in the air spaces in leaves and in return takes food material and shelter from plant.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.