This card describes the transpiration stream, the movement of water from roots to leaves driven by evaporation from mesophyll cells and the adhesive and cohesive forces of water in the xylem.
Tato karta popisuje transpirační proud, pohyb vody z kořenů do listů způsobený odpařováním z mezofylových buněk a adhezními a kohezními silami vody v xylému.
| Front | Transpiration stream 3.1.3(c)and(d) |
|---|---|
| Back | - (moves water up from roots to leaves) - water molecules evaporate from mesophyll cells surface into air spaces in leaf and move out stomata into surrounding air down conc gradient - this loss of water lowers WP of mesophyll so water moves in from adjacent cells (osmosis) along apoplast/symplast, repeated accross leaf to xylem, water moves out xylem (osmosis) and into leaf cells - water molecules form H2 bonds with carbs in xylem walls (adhesion) and with eachother (cohesion) resulting in water exhibiting capillary action, Now water drawn up xylem in continuous stream, replacing water lost (transpiration pull) - transpiration pull results in tension in xylem, helping water move across roots from soil |
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