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.
Xylem is the type of vascular tissue that moves water and dissolved nutrients from the roots to the leaves. The xylem are â¦ one-way roads, however. No particles can move down the tree through the xylem. Phloem are the tubes in plants responsible for transporting sugars from the leaves to the roots and vice-versa.plit and merge into it. Answer by Jimbo Wage. Confidence votes 1.2K. The vascular tissue system is one of three tissue systems that make up a plant, the other two tissue systems or ground and dermal, with dermal tissue being the outer layer and the ground tissue making up most of the inside of a plant.