Plants with woody stems are unique in that they experience secondary growth, which increases the girth of stems, branches, and roots.
Secondary growth is distinguished by an improved plant thickness or girth. Cell division in the lateral meristem results in this type of growth.
Herbaceous plants grow primarily, with hardly any secondary growth or thickness increase.
Secondary growth takes place at the lateral meristems. Cell division occurs at the meristems, where each cell multiplies in to the two daughter cells and contributes to the cellular material known as tissue.
Thus, due to secondary growth, the plant increases the girth of stems, branches, and roots.
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