Due to continuous secondary growth initiated by the vascular cambium, the epidermis and cortex get broken. How these protective layers are replaced in such plants?
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Conduction of water and minerals takes place through sapwood. Cork Cambium: When the girth of the stem increases due to secondary growth, the outer cortical and epidermal layers get broken. These layers need to be replaced by new protective layers. ... This meristematic tissue is called cork cambium or phellogen.
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