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A-Level Biology OCR A

Root Hairs Soil Water Describe Ways Cells Adapted

Root hairs are adapted as exchange surfaces by their microscopic size to penetrate soil, large SA:V ratio, thin surface layer for short diffusion distances, and high solute concentration to maintain a water potential gradient.

Los pelos radiculares están adaptados como superficies de intercambio por su tamaño microscópico para penetrar el suelo, una gran relación SA:V, una capa superficial delgada para cortas distancias de difusión y una alta concentración de solutos para mantener un gradiente de potencial hídrico.

Front Describe 4 ways that the root hairs of root hair cells are adapted as exchange surfaces,
Back Root hairs adaptations:
  • Microscopic size - penetrate easily between soil particles
  • Large SA:V ratio, lots of them on each root tip
  • Thin surface layer - short diffusion distances
  • Conc of solutes in cytoplasm maintains water potential gradient between soil water and the cell

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