Question

how is stem is different from stem tuber

Answer 1

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. ... The underground stem tuber is normally a short-lived storage and regenerative organ developing from a shoot that branches off a mature plant.

Answer 2

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Each tuber possesses number of spirally arranged depressions called eyes. Tuber stores food. A true stem bears a terminal bud for its growth. The stem is differentiated into nodes and internodes.