Stem Stem A stem is the mail part of the plant. The xylem carries water and minerals to the vascular tissue of the plant.
Phloem caries food that is moved around the plant.
The rings on a tree show the age of the tree. Bark is divide in to two parts they are the inner Bark that protection from fires and disease. The outer bark contains the phloem that is why if you girdle tree it dies ,actually starves the tree to death. After a long rain a cactus can hold up to 260 gallons of water. The stem connects to the root.