A prokaryotic, autotrophic, nitrogen-fixing symbiont is found in Cycas. Specifically, Cycas plants possess specialized structures called coralloid roots. These roots house cyanobacteria (such as Anabaena or Nostoc), which are: Prokaryotic: Lacking a defined nucleus.Autotrophic: Capable of photosynthesis to synthesize their own food. Nitrogen-fixing: Capable of converting atmospheric nitrogen into ammonia.

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