xylem tissue

• what is the xylem tissue


  this transports water and mineral ions
• what are the 4 type of cells that the xylem is composed of


  vessels tracheids fibres and xylem parenchyma
• what are vessels in the xylem


  cells that conduct water
• what are the tracheids in the xylem


  cells that conduct water
• which is more efficient at conduction water vessels or tracheids


  vessels
• what is the function of fibres in the xylem


  support
• what is xylem parenchyma


  living tissue
• what lines the walls of the vessels in the xylem and why


  lignin , its impermeable to water and supports the plant
• How are tracheids different to vessels int he xylem


  tracheids are more elongated with tapering ends
• why is it important that the xylem is impermeable


  so water keeps moving upwards
• why is it important that lignin is hydrophillic


  adhesion