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:
A. "A root stores nutrients, but rhizomes are underground stems that do not store nutrients."
B. "A rhizome is a modified root that is able to grow leaves."
C. "A rhizome has nodes and internodes and is really a modified stem that can exist underground."
D. "A rhizome, although a modified stem, acts as a root does. In other words a rhizome is a stem-root combination."
E. "A root grows vertically, not horizontally."
Answer: C
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