This card explains the pathways of water uptake from soil into roots and towards the xylem via the symplast (cytoplasmic) and apoplast (cell wall) routes, emphasizing the role of osmotic gradients.
Tato karta popisuje cesty příjmu vody z půdy do kořenů a k xylému přes sympastickou (cytoplazmatickou) a apoplastickou (buněčné stěny) cestu, zdůrazňujíc roli osmotických gradientů.
| Front | Water from soil to roots and towards xylem 3.1.3(d) |
|---|---|
| Back | - soil water low solute conc (high WP), root hair cell cytoplasm solutes (lower WP) so water moves in by osmosis - now this water in roots moves towards xylem in 1 of 2 routes - symplast (continuous cytoplasm of living plant cells connected through plasmodesmata) allows water to pass, root hair cells has higher WP than next cell along, so water moves to next cell by osmosis, continues until xylem reached, as water leaves root hair cell by osmosis, WP of cytoplasm dec, maintaining steep WP gradient Apoplast (cell walls and intercellular spaces where after passes) water fills spaces between fibres in cellulose cell wall, as water moves into xylem, more molecules pulled through apoplast behind them due to cohesive forces of water molecules, pull of water into xylem and up plant along with cohesive forces behind molecules creates tension (so continuous flow through open structure of cell wall) |
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