Vitamins in lettuce are plentiful. Its fresh leaves are an excellent source of several Vitamin-A and Î²-carotenes. Just 100 g of fresh, raw-lettuce provides 247% of daily vitamin A, and 4443 Âµg of Î²-carotene (Carotenes convert into vitamin-A in the body; 2 Âµg of carotene is considered equivalent to 1 IU of vitamin-A).
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other.he most distinctive xylem cells are the long tracheary elements that transport water. Tracheids and vessel elements are distinguished by their shape; vessel elements are shorter, and are connected together into long tubes that are called vessels. Xylem also contains two other cell types: parenchyma and fibers.
Function. Just like you have veins, arteries, and capillaries, plants have several different tissue types that make up their vascular bundles. Xylem is tissue that is responsible for transporting water and nutrients through the plant.Phloem is tissue that transports larger, organic molecules through the plant.unction. Just like you have veins, arteries, and capillaries, plants have several different tissue types that make up their vascular bundles. Xylem is tissue that is responsible for transporting water and nutrients through the plant.