Transport and Support 9.2

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Transport and Support 9.2
2
Mineral Uptake by Roots

• Whats the deal with branching roots and root
  hairs?
• Potassium, phosphate and nitrate among others
  move into the root system by A.T.

3
3 main ways ions can get to plant root systems

• 1. diffusion
• 2. mass or bulk flow
• 3. fungal hyphae mycchorizae

4
Structure and function of stems

• Stems connect flowers, leaves and roots
• Serve as transport pathways, via phloem and xylem
• Support in terrestrial plants

5
State that terrestrial plants support themselves
by a variety of means, including

• Structure of xylem vessels
• Cells are dead at maturity
• Cell walls are thickened extra cellulose and
  lignin (lignified)
• Cell Turgor (TP) ?
• Essentially one continuous tube

6
Define Transpiration

• The act or process of transpiring, especially
  through the stomata of plant tissue or the pores
  of the skin.

7
Water Transport Through Plants

• Cohesion-Tension Theory structure of x.v.,
  evaporation, cohesion, adhesion, tension,
  transpiration pull

8
State that guard cells can regulate transpiration
by opening and closing stomata
9
More guard cell and stomata images
10
Explain how abiotic factors light, temp, wind,
and humidity affect transpiration rate
11
HOMEWORK

• Define Xerophyte
• OUTLINE four adaptations of xerophytes that help
  REDUCE transpiration (due Monday)

12
Transport in Phloem OUTLINE the role of phloem
in active TRANSLOCATION of sugars (sucrose) and
amino acids from source to sink

• Translocation?
• Source to Sink?