Unit 3 Lesson 4 Transpiration and Translocation Systems

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Unit 3Lesson 4Transpiration and Translocation
Systems
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How do Plants Absorb and Transport Materials?

• Step 1 Roots have tiny hairs covered with thin
  membranes that allow water and nutrients to
  enter.
• Osmosis is the movement of water from an area of
  higher water concentration to an area of lower
  water concentration.
• Water enters the roots until the concentration in
  the root is equal to the concentration outside
  the root.
• The water entering the root also carries
  substances (nutrients)

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How do Plants Absorb and Transport Materials?

• Step 2 After absorption by the roots, water is
  passed from cell to cell until it reaches the
  xylem.
• Xylem is tissue, formed as tubes, that conducts
  water up the stems and to the leaves.
• The petiole of the leaf takes the water from the
  xylem in the stem of the leaf veins, which
  distribute it throughout the leaf.
• Rememberxylem move nutrients UP!

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How do Plants Absorb and Transport Materials?

• Step 3 Leaves loose water by transpiration.
• Transpiration occurs through tiny stomata
  (microscopic pores on the underside of leaves.
• Transpiration creates somewhat of an upward pull
  that assists the xylem in moving water and
  nutrients.
• Remember, translocation is the movement of
  sugars from the leaves through the phloem.

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How do Plants Absorb and Transport Materials?

• Step 4 Manufactured food (created by plant) is
  sent back out from the leaves, through the stems,
  and down to the roots in the phloem tissue.
• Phloem is the tissue, or plant tubing, that
  allows sugars, proteins, hormones, dissolved
  materials, and salts to move from the leaves to
  the other parts of the plant.
• Phloem are composed of sieve cells, which when
  hooked end to end, create a tube for transport.
• Remember, phloem carries sugar products back
  down

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Stomata
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Xylem and Phloem in a plant stem

• Xylem on inside
• Phloem on outside