A tuber is a thickened stem or rhizome used by a plant to store nutrients and for a-sexual reproduction. Some well-known tubers are potatoes and Jerusalem artichokes. Although plants such as the cassava or sweet potato are similar to the potato or Jerusaleum artichoke in appearance, they’re technically not “true” tubers as their enlarged storage structure is actually considered a root, which classifies them as a “tuberous root” or “root tuber” instead.
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