Some plants grows non-green underground stem that are perennial that is, they live for many years. This store reserve food, and are adapted for the perennation. During favorable situation underground stems give mount to aerial shoots. With the onset of unfavorable situation the aerial shoots die. During this period the underground stems stay dormant.
Such underground stems can be differentiated from roots by the following:
a. Existence of nodes and internodes
b. Existence of scale leaves and adventitious roots occurring from the nodes.
c. Existence of axillary and terminal bud.The four different kinds of underground stem are
1. Rhizome 2. Tuber3. Bulb 4. Corm
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