Question

is the fleshy underground part of ginger plant a root or a stem​

Answer 1

Ginger is a stem and not a root because it has nodes and internodes. Ginger is a rhizome, an underground modification of stem. Rhizome is a branched, prostrate, horizontally growing stem having nodes and internodes. On the nodes, sessile scale leaves are formed which bear buds in their axil.

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Answer 2

Its a stem............