* Storage of food: They store nutrients and energy for the plant, allowing it to survive harsh conditions or produce new growth.
* Perennation: They allow the plant to survive through unfavorable seasons (like winter) by providing a means for the plant to regenerate from its underground storage.
* Vegetative propagation: They can produce new plants through the formation of buds or adventitious roots.
Here are some examples of subterranean stems:
* Rhizomes: Horizontal underground stems that grow along the soil surface. They have nodes and internodes, and can produce roots and shoots at each node. Examples: ginger, turmeric, iris.
* Tubers: Swollen underground stems that function as food storage organs. They have "eyes" which are buds that can produce new shoots. Examples: potatoes, yams.
* Bulbs: Short, vertical underground stems that have fleshy leaves surrounding a central bud. They are adapted for storage and can produce new plants from the bud. Examples: onions, garlic, lilies.
* Corms: Swollen, underground stems that are similar to bulbs but are solid and do not have fleshy leaves. They have a basal plate and buds that produce new shoots. Examples: crocus, gladiolus.
By modifying their stems to grow underground, these plants have developed strategies to adapt to different environmental conditions and ensure their survival and propagation.
