<P> A woody plant is a plant that produces wood as its structural tissue . Woody plants are usually either trees, shrubs, or lianas . These are usually perennial plants whose stems and larger roots are reinforced with wood produced from secondary xylem . The main stem, larger branches, and roots of these plants are usually covered by a layer of bark . Wood is a structural cellular adaptation that allows woody plants to grow from above ground stems year after year, thus making some woody plants the largest and tallest terrestrial plants . </P> <P> Wood is primarily composed of xylem cells with cell walls made of cellulose and lignin . Xylem is a vascular tissue which moves water and nutrients from the roots to the leaves . Most woody plants form new layers of woody tissue each year, and so increase their stem diameter from year to year, with new wood deposited on the inner side of a vascular cambium layer located immediately beneath the bark . However, in some monocotyledons such as palms and dracaenas, the wood is formed in bundles scattered through the interior of the trunk . </P>

Advantages of a plant that produces woody tissue
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