Transport in flowering plants

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Transport in flowering plants

• Transpiration

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Transpiration

• Water is lost from a plant in the process of
  transpiration.
• This is the evaporation of water from plants.

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Transpiration

• Water is lost from three main areas of a plant
• Stomata in the leaves, account for about 90 of
  water loss
• Cuticle the waxy layer, some water is lost
  through diffusion
• Lenticles woody stems have loosely packed cork
  cells through which gas exchange occurs a
  little water is lost here

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Transpiration

• Water moves through the plant from roots to
  leaves and is lost to the air as water vapour.
• This is known as the transpiration stream.
• About 98 of water entering a plant is lost to
  the air through transpiration
• Remaining 2 is used for photosynthesis

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stem
roots
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stem
roots
Water enters roots by osmosis
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stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
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stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
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stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
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The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
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The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
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The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
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Transpiration water evaporates from leaves
The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
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Transpiration water evaporates from leaves
The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
Mineral ions enter by active transport
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Transpiration water evaporates from leaves
The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
Mineral ions enter by active transport
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Transpiration water evaporates from leaves
The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
Mineral ions enter by active transport
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Transpiration water evaporates from leaves
Photosynthesis produces sugar in the leaves
The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
Mineral ions enter by active transport
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Transpiration water evaporates from leaves
Photosynthesis produces sugar in the leaves
The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
Mineral ions enter by active transport
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Transpiration water evaporates from leaves
Photosynthesis produces sugar in the leaves
The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
Mineral ions enter by active transport
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Transpiration water evaporates from leaves
Photosynthesis produces sugar in the leaves
Sugar is transported in phloem
The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
Mineral ions enter by active transport
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Transpiration water evaporates from leaves
Photosynthesis produces sugar in the leaves
Sugar is transported in phloem
The movement of water through the plant is called
the transpiration stream
stem
Water and ions pass up xylem
roots
Water enters roots by osmosis
Mineral ions enter by active transport
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Transpiration

• Deforestation decreases the rate of transpiration
  due to the large-scale removal of forest which
  normally add water vapour to the air
• This can have a serious effect upon the water
  cycle

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Transpiration
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