NTA Abhyas NEET2020BotanyMineral NutritionPractice
Which of the following associations fixes nitrogen through non-nodulation?
Options
- ARoots of leguminous plants associated with Rhizobium.
- BCoralloid roots of cycas in association with Anabaena.
- CBoth a and b
- DNone
Correct answer
B. Coralloid roots of cycas in association with Anabaena.
Step-by-step solution
Cyanobacteria like Aanabaena is known to form a facultative symbiotic relationship with the coralloid roots of Cycas and helps with nitrogen fixation without forming nodules and in turn, provides food and a stable environment.