America's Source for High School Sports and the leading volleyball organization team up to honor the nation's best. (Week of 9/2-10/4).
Phloem Structure Phloem is composed of several cell types including sclerenchyma, parenchyma, sieve elements and companion cells. The sieve element and companion cell are found closely associated with each other in what is referred to as the sieve element/companion cell complex.
These systems use continuous tubes called xylem and phloem: - Xylem vessels carry water and minerals from the roots to the leaves. - Phloem tubes carry sugar & other organic nutrients made by plant from the leaves to the rest of the plant.Structure of the xylem tissue. Xylem vessels consist of dead cells.They have a thick, strengthened cellulose cell wall with a hollow lumen. Phloem tubes carry sugar & other organic nutrients made by plant from the leaves to the rest of the plant. Structure of the xylem tissue. Xylem vessels consist of dead cells. They have a thick, strengthened cellulose cell wall with a hollow lumen.