Symbiotic Association: Cycas plants possess specialized vegetative structures called coralloid roots.

Cyanobacteria Presence: These roots contain a specific algal zone where nitrogen-fixing cyanobacteria, such as Nostoc and Anabaena, reside.

Function: The cyanobacteria provide fixed nitrogen to the plant, which is especially beneficial in nutrient-poor soils, while the plant provides a protected environment for the bacteria.

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