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.
Making the world better, one answer at a time. The vascular system in plants have two components: xylem and pholem. The xylem helps in the transport of water absorbed through roots to all the aerial parts of the plant and the phloem helps in transporting the manufactured food from leaves to all other parts of the plant.here are two types of vascular tissue in a plant. Phloem, which conveys food from the leaves to the rest of the plant, and xylem which conveys water from the roots to the res â¦ t of the plant.