Chapter 9// Transport in Plants Flashcards
How are assimilates loaded in the phloem
Charged particles are moved out of the companion cells by ACTIVE TRANSPORT which creates a concentration gradient between the companion cells + its surroundings
The charged particles are then co-transported by FACILITATED DIFFUSION into companion cells, these assimilates build up into companion cells and move by DIFFUSION into the sieve tube element
What are xylem vessels adapted for transporting
Water and mineral ions = xylem
What is phloem tissue adapted for transporting
Organic solutes (sucrose+ amino acids) =phloem
How are companion cells linked to sieve tube elements
Plasmodesmata
What is plasmodesmata
Narrow threads of cytoplasm that link adjacent plant cells (they’re lined w plasma membrane)
What is a tonoplast and what is it’s function
Vacuole membrane
Keeps vacuole acidic allowing it to break down food matter
Symplast pathway goes thru what parts of the cell
Goes thru living parts of the cell
why is apoplast pathway the main pathway
Because it provides the least resistance
Apoplast pathway goes thru what part of the cell
‘Non-living parts’ it’s the extra cellular space that surrounds the symplast
It goes thru CELL WALLS
Mineral ions are moved into the root hair cell by ________
ACTIVE TRANSPORT
What happens at the casparian strip
All the water is forced into the symplast pathway by the casparian strip (cuz Suberin is waterproof)
