xylem structure

• What are the two main types of tissue in xylem?

  Xylem vessels and xylem fibers
• What is the primary function of xylem vessels?

  To carry water and dissolved minerals
• What happens to the living contents of xylem vessels?

  They die as lignin forms in the walls
• What is lignin's role in xylem vessels?

  It prevents substances from passing through
• What are pits in xylem vessels?

  Regions free of lignin allowing substance passage
• How do pits benefit xylem vessels when blocked?

  They allow water to move to different vessels
• How does lignin contribute to the structure of xylem vessels?

  It helps prevent vessels from collapsing
• What type of cells form xylem fibers?

  Long narrow cells
• What is the primary function of xylem fibers?

  To provide mechanical support for the plant
• What type of tissue is xylem considered?

  Non-living tissue
• What role do parenchyma cells play in xylem?

  They can store starch and contain tannins
• How do tannins in parenchyma cells benefit the plant?

  They deter herbivores from eating the plant
• What are the key components of xylem structure and function?

  • Xylem consists of xylem vessels and fibers
  • Xylem vessels carry water and minerals
  • Xylem fibers provide mechanical support
  • Lignin forms in cell walls, making them impermeable
  • Pits allow water movement between vessels
  • Parenchyma cells store starch and contain tannins