1. It is a swollen root
It is a swollen underground stem
2. Apical bud is absent
Apical bud is present
3. Nodes and internodes are absent
Presence of nodes and internodes
4. No development of chlorophyll
On exposure to sunlight, stem tubers may develop chlorophyll
5. Scaly leaves and auxiliary buds are absent.
Scaly leaves and auxiliary buds are present.