Water Potential and movement in Plants Flashcards
If the water potential is too low, what happens?
Water moves in by osmosis.
If water potential is too high, what happens?
Water moves out by osmosis.
What happens if water continues to leave the cell?
The plasma membrane will lose contact with the wall which leaves the cell plasmolysed.
What is the movement of water into the xylem?
Epidermal cells, cortex, endodermis, pericycle and cambium, xylem.
What are the 2 pathways?
Apoplast pathway + Symplast pathway.
What does the Apoplast pathway travel through?
The cell walls
What is the symplast pathway?
Water travels into cytoplasm and through the plasmodesmata.
Which pathway is the casparian strip involved in?
Apoplast pathway
What does it do?
It blocks the apoplast pathway and ensures water + dissolved mineral ions have to pass into the cell cytoplasm through the plasma membranes.
How does water move into a root hair cell?
Absorbs mineral ions and water from the soil. Water moves across the root cortex down a water potential gradient to the endodermis of the vascular bundle.
