PLANT TISSUES

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PLANT TISSUES
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1) Dermal Tissue

• Form outermost layer of plant (like the skin)
• Protects plant
• Allows substances in and out through the stomata
  (will discuss details later)

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2) Vascular Tissue

• Makes the transport system that moves minerals,
  water and other chemicals around plant (like
  circulatory system)
• 2 types of vascular tissue
• Xylem transports water and minerals UP from roots
• Made up of dead tissue ? basically hollow tubes
• Phloem transports water and sugar produced by
  photosynthesis up and down
• Made up of living tissue

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3) Ground Tissue

• Form the bulk of the plant
• Wide variety of functions
• Where photosynthesis occurs
• Provide structural support
• Storage

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In root
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In Stem
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• copy from pg.130 into notes

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Tissues Working Together

• Plants need to perform photosynthesis
• CO2 H2O light energy? C6H12O6 O2
• Plants need to be able to get reactants (carbon
  dioxide and water) to the chloroplasts!

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Light

• Chloroplasts located in palisade layer and
  spongy mesophyll
• Palisade layer closely packed to capture light
• Spongy mesophyll loosely packed to allow
  movement of gases

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Carbon Dioxide

• Enter through stomata and then move through
  spongy mesophyll

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Water

• Water is absorbed into roots (via root hairs)
• Water is transported from roots to leaves by
  xylem
• Waxy cuticle and stomata prevent too much water
  loss

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STOMATA

• Openings in the dermal tissue that
• Control amount of CO2 entering leaf.
• Control amount of water lost

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• Opening and Closing
• Each stoma is bordered by two guard cells

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• Able to open and close by changes in amount of
  water in guard cells
• Water flows in to guard cells, they swell and it
  causes stoma to open
• Water flows out from guard cells, they shrink and
  it causes stoma to close

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Factors Affecting Stomatal Opening

• As Water Loss increases stomata close
• Carbon dioxide concentration increases stomata
  close
• Light stomata open in light and close in dark
• Temperatures higher then 300C to 350C result in
  stomata closing
• Also show a daily rhythm