Chapter 36 Flashcards
(22 cards)
What is active transport ?
Movement of molecules across cell membrane from region of high to low concentration
What is passive transport?
Diffusion from Area of high to low concentration does not require energy
What are the 3 transport methods?
Apoplast, simplast , transmembrane
Where is apoplast
Externat cell membrane
Where is symplast ?
Cytosol
Water potentiel
Physical property that prédits direction of water flow
What affects water potential?
Solute concentration and physical pressure
What is the internal pressure of a living plant cell
0.5 map
Turgor pressure
Cell wall pressing against protoplast build up of internal pressure
Flaccid
Limp / losing water
What is used in long distance transport?
Bulk flow
Bulk flow?
Movement of liquid inresponse to pressure gradient. High to low pressure
Osmosis. Vs bulk flow
Bulk flow is independent of solute concentration
Where does bulk flow occur?
Tracheas and vessel elements
Sieve tube elements
Path of water (xylem) through different parts
Epidermis of roots → root cortex → vascular cylinder
Endodermes
Explain xylème transport
Transpiration
Cohésion tension
Capillaire action
Root pressure
Transpiration
Lors of water through levés
How does wilting occur?
Water lost from transpiration is not replenished by roots
What controls opening and closing of stomate
Abscisic acide and circadien rhythm
Source ?
Where sugar or glucose is (originally)
Sink ?
Glucose travels there to neighboring cells that need starch for energy
What is Plasmodesmata?
Highly dynamic compontuts of symplust
