transport in plants ocr as level


  • plant structure 
  • xylem 
  • transport systems
  • plant cells and water 
  • movement across the root 
  • movement of water 
  • transport of water in a plant
  • casparian strip 
  • transpiration 
  • factor affecting transpiration 
  • potometer
  •  Adaptions in xerophytic plants
  • phloem
  • translocation 
  • mass flow 
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PLANT BASICS…read more

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· Xylem and phloem come from dividing meristem cells
such as cambium
· Meristem cells undergo differentiation to form the
different kinds of cells in the transport tissue
· Xylem tissues consist of xylem vessels with
parenchyma cells and fibres
· Meristem cells produce small cells elongated,
· the ends of the cells breaks down so that they become
continuous, long tube with a wide lumen
· The lignin makes the walls impermeable so in effect
· The lignin makes the vessels and prevents them from
collapsing…read more

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· The role is to transport water and nutrients
· The sidewalls have bordered pits (unlignified areas) to
allow lateral movement of water
· Parenchyma: Living cells with thin cellulose walls.
They can store water, which makes them turgid and
so gives them a supporting role.
· Fibres: They provide strength because their walls
are lignified (and therefore, dead).
· The transport system in plants moves water in special
tissue called vascular tissues
· Water and soluble minerals travels upwards in xylem
tissue…read more

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· Vascular tissue is distributed throughout the plant,
· Xylem and phloem are found together to make vascular
· These bundles also contain types of tissues that give the bundle some strength
and help to support the plant
· The vascular bundle is a special sheath of cells called
· The endodermis has a key role in getting water in to xylem
· Just inside the endodermis is a layer of meristem cells called the pericycle
· The lignin are in the patterns in the cell wall, this
prevents the vessels from being too rigid and allows
flexibility of stems or branch…read more

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Adaptions of the xylem to its function:
· made from dead cells aligned end-to-end to form a
continuous column
· The tubes are narrow so the water column doesn't
easily and capillary action can be effective
· Pits in the lignified walls allow water to move sideways
from one vessel to another
The flow of water is not impeded because:
· There are no end walls
· There are no cell contents
· There is no nucleus or cytoplasm
· Lignin thicken prevents the walls from collapsing…read more

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