Final answer:
A rhizome is a modified stem that grows horizontally underground and has nodes and internodes. It allows plants to spread horizontally and produce new shoots. Examples include ginger and ferns.
Step-by-step explanation:
A rhizome is a modified stem that grows horizontally underground and has nodes and internodes. It is a stem modification that allows plants to spread horizontally and produce new shoots from buds on the rhizome. Examples of plants with rhizomes include ginger and ferns.