Palm is a monocotyledonous plant, yet it increases in girth slowly due to secondary growth. It is due to parenchymatous cell division and enlargement in the ground tissue. Thus, repeated divisions cause increase in girth of stem.
This type of secondary growth is known as Diffused secondary growth.
The monocotyledonous plant does not have primary cambium in the vascular bundles. But in palm a secondary cambium may be formed in the hypodermal region and that forms conjunctive tissue and meristematic cells.
The meristematic cells form new tissues to increase the girth of the stem.
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