The plant has 2 function system to transport food, water and minerals all around. Among the two are xylem and phloem. While Xylem carries water and minerals all the way from the roots to the leaves, phyloem however transport sugar and other nutrients around the plants. Xylem tissue consists of a variety of specialized, water conducting cells which are known as tracheary elements. However, Xylem vessels consist of dead cells. They have thick, strengthened cellulose cell wall with a hollow lumen. The end walls of the cells have disappeared, so a long, open tube is formed. The walls of the xylem vessel contains holes called pits which water enters through.
As the xylem vessel is specialised to transport water and minerals from the root up to other parts of the plant, it also helps supporting the stem and strengthening it as well
Invasive species are among the leading threats to native wildlife. Approximately 42 percent of threatened or endangered species are at risk due to invasive species. These species were brout from other countries and they cause problems in these other countries or continents. Like the bees in america were not native and neither werer the cattle in the western hemisphere.
