The purpose of heat tape is to maintain and control pipes and vessels. This also keeps the heat that is being radiated from the pipes and vessels inside.
Wood vessels are the thin "tubes / pipes" that transport the water in the stem (trunk) of a woody plant. They consist of many linked empty cells, the wood vessel members. These have perforations in the ends and link toghether to form long tubes, the wood vessels. Wood vessels carry water and minerals from the roots of a woody plant (a tree, for instance) to the leaves.
Xylem vessels
Vessels are in a animal cells, not sure about plant cells.
pineapple
stem
The two main pipes are plastic and metal. Plastic pipes have polyvinyl chloride and the metal pipes are either copper or stainless steel. Not all pipes have the same effective or be used the same.
Nonvascular pant.
The xylem vessels.
U-Boats
vascular plants are plants that have vessels
They are parasites of the fungi associated with plant roots.