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Plant Physiology
1. Plant Parts a.k.a. Plant Organs
2. Plant Tissues
3. Water Transport
4. Food Transport
Water Transport
 Xylem transports water and minerals from soil
through roots to tip top of plant
 HOW???
 osmosis through root hair
 root pressure “pushes” water into xylem
 water forms continuous narrow column due to
adhesion and cohesion properties of water
molecules
 the loss of water due to transpiration (evapouration
of water through the stomata of the leaves) creates
a “pulling” force up the xylem
 NO ENERGY IS REQUIRED
Water Transport
Guard Cells
Food Transport
 Pressure – Flow Theory
 sugars are pumped into phloem and move
down to root due to difference in water
pressure between the leaf and phloem
 NO ENERGY IS REQUIRED
Food Transport