8.1 Xylem & Phloem

• Xylem: Transports water and mineral ions and support from roots to leaves.
• Phloem: Transports sucrose and amino acids from stems to growing tissues and storage tissues.
• Vascular bundles: A group of xylem vessels and phloem tubes.
• Root transverse

  A) Epidermis

  B) Cortex

  C) Endodermis

  D) Xylem

  E) Phloem

  
• Stem transverse

  A) Phloem

  B) Xylem

  C) Epidermis

  D) Cortex

  E) Vascular Bundle

  
• Xylem:

  • Carries water and minerals to the leaf.
  • Made of dead cells
  • Cell wall made of lignin.
  • No cytoplasm
  • thick cell wall
  • Flow is upwards.
• Phloem:

  • Carries glucose to growing parts and storage organs
  • Made of living cells
  • Cell wall made of cellulose
  • permeable cell walls
  • thin cell walls
  • flow is up and down