Biology Plant Stems

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  • Created by: Hayley
  • Created on: 09-11-12 18:46
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  • Plant Tissues
    • Epidermis
      • Outer layer of the stem
        • Protects cells underneath
      • Secrets cutin (waxy substance)
        • Prevents water loss
        • Protects against entry of pathogens
      • Hairs
        • Insulation (traps moist air)
        • Hooked
        • Protective (chemicals)
    • Parenchyma
      • Packing tissue
      • Unspecialised
      • Modified into Collenchyma and Sclerenchyma
    • Collenchyma
      • Thick primary cell walls, thicker at corners- strength
      • Just inside epidermis
      • Living
    • Sclerenchyma
      • Develops as plant gets bigger
      • Found around vascular bundles
      • Strong secondary cell walls
        • Made of cellulose microfibrils
      • Lignin deposited on cell walls
        • Once lignified, cells die
          • Lignin inpermeable to water

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