Corms, rhizomes, and tubers are examples of underground stems. These are specialized plant structures that grow underground and serve as storage organs for the plant. They help the plant survive during unfavorable conditions, such as drought or winter, by storing nutrients and energy for future growth. Corms are short, swollen underground stems that are used for food storage. Rhizomes are horizontal, underground stems that grow along or just beneath the surface of the soil, producing roots and shoots at intervals. Tubers are enlarged, fleshy underground stems that grow at the end of stolons and store nutrients for the plant. Examples of plants that have these underground stems are taro, ginger, potato, and yam.