Concept:Ginger is a modified underground stem called a rhizome, which is identified by the presence of nodes and internodes — a feature absent in roots.
Explanation:A stem typically has nodes (where leaves and buds arise) and internodes (the spaces between nodes).
Ginger shows a brownish line marking nodes and internodes.
Scale leaves, axillary buds, and a terminal bud are present at the nodes.
These structures allow ginger to produce aerial shoots and roots from the nodes.
In contrast, true roots lack nodes and internodes and do not bear buds or leaves.
Ginger grows horizontally underground, but that is not the defining stem feature.
Storing food and lacking chlorophyll are also seen in many roots, so those are not unique to stems.
The key distinction is the presence of nodes and internodes, which confirms ginger is a stem.
Thus, the correct reason is that it has nodes and internodes.
Answer:Option B: it has nodes and internodes.