Water Transport

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Water Transport
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Root Anatomy

• The cross section of a root contains the
  Epidermis, Cortex, and Vascular Cylinder from
  outside to inside
• The Vascular Cylinder is composed of the
  endoderm, pericycle, xylem, and phloem

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Root Transport

• The epidermis of the a root contains Root Hairs
  that greatly increase the surface area of the
  root and thus promote the absorption of water
• Cells in the endoderm are selectively permeable
  to solutes which promotes the osmotic movement of
  water
• The Casparian Strip in the endoderm restricts the
  movement of water back into the cortex

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Vascular Cylinder

• The vascular cylinder contains the xylem and
  phloem
• The xylem is composed of dead cells called
  Tracheids and Vessel Members

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Stem Anatomy

• The cross section of the stem contains the
  Epidermis, Cortexs and Vascular Cylinder like the
  roots

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Stem Transport

• The adhesive and cohesive properties of water
  that allow this polar molecule to form hydrogen
  bonds with itself and with other substances
  promotes movement of water in thin tubes like the
  xylem
• This process is called Capillarity

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Leaf Anatomy

• The cross section of a leaf contains the Cuticle,
  Epidermis, Palisade and Spongy Mesophylls, and
  Veins which contain the plants vascular tissue

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Leaf Transport Cohesion-Tension Theory

• Transpiration or the evaporation of water from
  the surface of leaves places Tension on a column
  of water molecules existing from the leaf back to
  the roots