A friend who is not a biologist tells you that she grows irises from iris roots.You explain to her that the "root" she is planting is not a root,but instead is called a rhizome."Why?" she asked.You explain.

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A rhizome is a horizontally growing stem that can exist underground. It has nodes and internodes and can give rise to new shoots and roots. It is different from a root because a root grows vertically and does not have nodes and internodes. Additionally, rhizomes are modified stems, not roots, so they are not responsible for storing nutrients like roots are.

A Friend Who Is Not a Biologist Tells You That