Biology Plant Stems
- 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)
- Outer layer of the stem
- 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
- Once lignified, cells die
- Epidermis
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