12.4 roots
DESCRIPTION
12.4 Roots. Pages 558-563. Roots. Ta Phrohm temple in Cambodia. Function. Anchor plant Absorb water and nutrients Store water and carbohydrates. Types of Roots. TaprootFibrous roots. Root hairs. Microscopic hair-like outgrowth from an epidermal cell. - PowerPoint PPT PresentationTRANSCRIPT
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12.4 Roots
Pages 558-563
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Roots
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Ta Phrohm temple in Cambodia
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Function
• Anchor plant• Absorb water and nutrients• Store water and carbohydrates
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Types of Roots
Taproot Fibrous roots
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Root hairs
• Microscopic hair-like outgrowth from an epidermal cell.
• Increase surface area for absorption
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Root cap
• Thick layer of cells produces a slippery substance allowing root to penetrate soil
• Meristem
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Cortex
• Parenchyma• Stores carbohydrate• Water passes through cortex
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Endodermis
• Wrapped with a wax-like substance.• Form a barrier called the Casparian strip
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Vascular cylinder
• Eudicot Monocot• Gymnosperms
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Root Specializations
• 80% of plants have mutualistic relationships with mycorrhizal fungi
• Also, nitrogen-fixing bacteria such as Rhizobia are found in the root nodules of legumes
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Roots continued…
• Tuberous roots: lateral roots used for storage• For example: yam• Adventitious root: prop root
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Uses of roots
• Food• Medicine• Erosion control