RP8

• Plant fibres


  Fibre-like structures within a plant, generally referring to the vascular bundle (xylem and phloem) and sclerenchyma fibres (lignified support tissues)
• Tensile strength


  The maximum pulling force that can be applied to a tissue before the tissue breaks
• Equipment


  • Forceps
  • White tile
  • Sample of New Zealand flax plant
  • Scalpel
  • Suspended masses
• Method


  1. Use forceps to separate the fibres

  2. Test the tensile strength of the fibres by using suspended masses to compare e.g. types of fibres, internal vs external fibres etc.
• Hazards


  • Cuts from sharp object (scalpel)
  • Contamination (biohazard)
• Safety precautions


  • Cut away from fingers; use forceps to hold sample whilst cutting, keep away from edge of desk
  • Use disinfectant; wash hands with soap after handling
• In emergency


  • Elevate cuts; apply pressure; seek medical assistance
  • Seek assistance
• Risk level


  • Low
  • Low
• The plant used could also be stinging nettles instead of the New Zealand flax plant. The practical works the same way, but the nettles must be soaked for a week to soften and rubber gloves must be worn to avoid being stung.