Concept:These structures are swollen, underground plant parts that store food and can produce new plants.
Explanation:Corms, rhizomes, and tubers are all modified stems, not roots.
They grow below the soil surface, so they are called underground stems.
They have nodes, internodes, buds, and sometimes "eyes" (as in potato tubers).
These features clearly show their stem nature.
Underground roots, on the other hand, do not have nodes or buds.
Aerial stems grow above the ground, like normal plant shoots.
Modified leaves, such as tendrils or spines, perform different functions.
Because corms, rhizomes, and tubers store food and bear buds while staying under the soil, they belong to the category of underground stems.
Answer:B. underground stems