bell ringer: 9/19sammonssci.weebly.com/.../9-19_plant_transport_ppt.pdfincludes mosses (bryophyta),...
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Bell Ringer: 9/19
Gymnosperm or Angiosperm?
1. This plant has a finite growing season and the
seeds are encased in tissue.
2. This plant will stay green year around and has
“naked seeds”.
3. Monocot and Dicot are the two types of the
seed plant.copyright cmassengale 1
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Plant Transport
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Taxonomy Plants are divided
into two groups Based on the
presence or absence of an internal transport system for water and dissolved materials
Vascular vs. Nonvascular
Vascular Bundles
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Nonvascular Plants
Do not have vascular tissue for support or conduction of materials
Called Bryophytes
Require a constantly moist environment Moss Gametophytes &
Sporophytes
Sporophyte stage
Gametophyte Stage
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Nonvascular Plants
Plants can’t grow as tall Cells must be in direct contact with moisture
Materials move by diffusioncell-to-cell
Sperm must swim to eggthrough water droplets
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Nonvascular Plants
Includes mosses (Bryophyta), liverworts (Hepatophyta), and hornworts (Antherophyta)
Liverworts Hornwortscopyright cmassengale
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Vascular Plants
Also called Tracheophytes
Subdivided into two groups --Seedless vascular plantsand Seed-bearing vascular plants (Angiosperms and Gymnosperms)
Club Mosscopyright cmassengale
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Vascular System
Xylem tissue carries water and minerals upward from the roots
Phloem tissue carries sugars made by photosynthesis from the leaves to where they will be stored or used
Sap is the fluid carried inside the xylem or phloem
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Vascular Tissue of Root
Plays a key role in
water and mineral
transport.
Root hair provide large
surface area for uptake.
This is where most
water and minerals are
absorbed.
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Vascular Tissue in Stem
Monocots- vascular bundles are scattered
thoughout the stem.
Dicots- vascular bundles are in a cylinder.
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Vascular Tissue in Leaf
Photosynthesis!
Because water also
evaporates from
surfaces and lost to
atmosphere
Transpiration occurs!
Lost water is drawn in
through xylem vessels.
Gas exchange also
occurs here. copyright cmassengale 11
When plants give off O2 they open stomata, but then close again so that too much water loss does not occur. They keep them open long enough for photosynthesis to occur.
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Transport in Plants
Water Transport
- The combination of root
pressure, capillary
action, and transpiration
provides enough force to
move water though xylem
even in the tallest plants.
- Capillary action- cohesion +
adhesion (water molecules
stick together)
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Transport in Plants
Nutrient Transport
- Nutrients are pushed though phloem. This process
moves sugars from sources to a sink.
- Sources are where sugar is produced, sinks is a cell
where sugar is used or stored.
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As nutrients move, this changes
concentration levels and changes movement
in fluid. As a result- phloem is about to
move nutrients any where it is needed.
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Stations!
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