plant transport lecture plants need a way to transport materials through their bodies, too. vascular...
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PLANT TRANSPORT LECTUREPLANT TRANSPORT LECTURE
Plants need a way to transport materials through their bodies, too.
Vascular tissue – cells used by plant to transport nutrients and water.
Types of Vascular TissueTypes of Vascular Tissue
XYLEM – Dead cells that form “pipes” to carry water from roots through leaves.
PHLOEM – Tubes made from living cells to transport food; phloem = food
Types of Vascular TissueTypes of Vascular Tissue
XYLEM – Only carries UP
PHLOEM – Carries food in all directions (UP and DOWN)
MONOCOTSMONOCOTS
Definition – Have only one cotyledon (embryo leaf).
Example – Corn, grass, tulips.
MONOCOTSMONOCOTS
Stem pattern – Scattered xylem and phloem.
LARGE CELLS ARE XYLEM
SMALL CELLS ARE PHLOEM
MONOCOTSMONOCOTS
Root pattern – fibrous
MONOCOTSMONOCOTS
Root pattern (xylem and phloem) – ring
MONOCOTSMONOCOTS
Leaf pattern – veins are parallel
MONOCOTSMONOCOTS
Flower pattern – parts are in multiple of 3’s.
DICOTSDICOTS
Definition – Have two cotyledons (embryo leaves).
Example – Trees, beans, carrots.
DICOTSDICOTS
Stem pattern – Ring-shaped xylem and phloem.
LARGE CELLS ARE XYLEM
SMALL CELLS ON OUTSIDE ARE PHLOEM
DICOTSDICOTS
Root pattern – taproot
DICOTSDICOTS
Root pattern (xylem and phloem) – X-shape
DICOTSDICOTS
Leaf pattern – veins are branched.
DICOTSDICOTS
Flower pattern – parts are in multiples of 4’s or 5’s.
MATERIALS TRANSPORTEDMATERIALS TRANSPORTED
XYLEM – WATER
DISSOLVED MINERALSHORMONES
PHLOEM – FOOD/SUGAR
OXYGENHORMONES
GIRDLINGGIRDLING
Definition – Removing bark from a tree; fluid leaks out.Why is fluid sweet? Cutting phloem that transports sap (food).
End result – Tree dies.
GIRDLINGGIRDLING
HOW DOES XYLEM WORK?HOW DOES XYLEM WORK?
Successive Osmosis – Water flows high to low
Soil root hairs epidermis cortex xylem
HOW DOES XYLEM WORK?HOW DOES XYLEM WORK?
Cohesion of water molecules – Water is “sticky”
HOW DOES XYLEM WORK?HOW DOES XYLEM WORK?
Transpiration – Leaves “sweat” water which pulls water up xylem tube.
More than 90% of water absorbed is lost by leaves.
Ex. Tomato plant loses 25 gallons of water per season; corn plant loses 51 gallons.
HOW DOES XYLEM WORK?HOW DOES XYLEM WORK?
Turgor presure – Weight of soil pushes down on roots and squeezes water up.
Monocot or Dicot?
Dicot Monocot
Monocot or Dicot?
Dicot
DICOT ROOTDICOT ROOT
1 - Epidermis
2 - Cortex
Where would root hairs be?
How would you know where the starch is?