Relier Pairs Tree Parts Matching Version en ligne Match each tree part to the appropriate description par Samantha Foster 1 Sapwood 2 Cambium 3 Heartwood 4 Outer Bark 5 Inner Bark Cell layer that produces new bark (phloem) and new wood (xylem) every year. The living xylem that transports water and nutrients up from the roots. Dead phloem cells that protect the tree from diseases and insects. Composes most of the trunk and is made up of dead xylem cells; is like the backbone that supports the tree. Scientific name phloem; supply line that carries food from leaves to branches, stems and roots.