Explain how the bark of a tree is formed. How does it act as protective tissue?
Strip of secondary meristem replaces the epidermis of the stem. Cells on the outside are cut off from this layer. This forms the several-layer thick cork or the bark of the tree.
Cells of cork are dead and compactly arranged without intercellular spaces and have a chemical called suberin in their walls that makes them impervious to gases and water.
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