The xylem is made from dead, hollow cells. <span> Tracheids and vessel elements are the main components of xylem witch have a function to transport water. Those are elongated dead cells at maturity (without protoplast) with a thick, strengthened cellulose cell wall and a hollow lumen. Even though they are dead they still maintain a function, because are being protected by surrounding living cells.</span>
Explanation:Because when xylem cells are first formed a chemical called lignin is deposited in spirals in the cell wall causing the cells to die and leave long hollow tubes which allow the movement of water and mineral ions through for healthy plant growth
substances can move from areas of low concentration to areas of high concentration
Explanation:
usually substances move across their concentration gradient which is from high concentration to low concentration. Active transport can allow substances to move against their concentration gradient.
