Question

what is a tuber ? name one stem tuber and one root tuber.

Answer 1

Stem tubers. A stem tuber forms from thickened rhizomes or stolons. The top sides of the tuber produce shoots that grow into typical stems and leaves and the under sides produce roots. They tend to form at the sides of the parent plant and are most often located near the soil surface.

Answer 2

Tubers are enlarged structures in some plant species used as storage organs for nutrients.
Stem tuber-potato
Root tuber-sweet potato