Movement of water Flashcards
How is water taken into the root?
-mineral ions taken up via active transport which decreases water potential in root hair cell
-water taken into root hair cell by osmosis
How does water reach the xylem?
via either apoplastic or symplastic pathway
What is the symplastic pathway?
movement from one cell to another, through living parts of cell- the cytoplasm and plasmodesmata
What is the name of the process by which water moves through the symplast pathway
osmosis
What is the apoplastic pathway?
water movement through non living parts of cell-cell wall and other intercellular spaces
How does water move through the apoplastic pathway?
-can diffuse through absorbent cell walls, or pass through spaces between them
-water can carry solutes and moves from high hydrostatic pressure to low-example of mass flow
Which is the main pathway and why?
apoplast pathway as it provides the least resistance
What is plasmodesmata?
small channels between call walls of two plant cells that is essential for transport of water, ions and other substances
What is the relevance of the casparian strip and the apoplastic pathway?
-casparian strip in endodermis cells stops further passage of water through cell wall
-water moves into cell through partially permeable cell membrane, and then out through xylem
What happens in the stem?
upward water movement via xylem vessels, as part of transpiration
What happens in the leaves?
-O2 leaves
-CO2 enters for photosynthesis
Equation of photosynthesis
carbon dioxide + water = oxygen + glucose
What happens to glucose produced in photosynthesis?
it is converted into sucrose and transported to cells via phloem, as part of translocation
