The center of a tree or shrub stem (from roots to trunk, branches, and twigs) is woody, composed of xylem cells that conduct water from the roots to the upper parts of the tree. That woody section is ...

Trunk A tree's trunk is made of wood and is covered in bark. The trunk of a tree is like the stem of a small plant, only a lot stronger. It too carries water around the tree. Roots The roots of a ...