Question

What do you understand by symbiotic nitrogen fixation?

Answer 1

• When nitrogen fixation is performed by a mutualistic relation established between a microbe and plant, the process is called symbiotic N₂ fixation. 
• Here the two alone independently can not carry out the process and  N₂ fixation has an outcome of the interaction of the microbe and the plant. 
• Example: Root nodule of leguminous plants containing Rhizobium bacteria. 
• Anabaena alga present in the leaves of Azolla (A pteridophyte).