![]() For example, the thick bark of Sequoiadendron giganteum (giant redwood) contains no flammable pitch or resin, allowing the tree to survive intense fires. The bark of each type of tree has evolved to adapt to the environment in which the species grows. Finally, bark helps defend a tree against fire, mechanical injury, and parasitic plants. It deters invading insects, bacterial infection, or fungal spores, and damage by animals, which are attracted to the sugar-rich sap transported by the vascular phloem from the leaves to the rest of the plant. Trunk Layers: Bark and underlying layers of a tree trunk (VA Tech) Bark and Its Functionsīark is the outermost covering of dead tissue (cork), which protects a woody plant against the effects of weather, such as temperature extremes, scorching by sun, and drying by wind.
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