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Plant Transport Systems (Cohesion-Tension Theory (transpiration draws H2O…
Plant Transport Systems
Turgor pressure
positive pressure in cells
maintains structure of leaves
water potential
used to transport H2O to leaves
Cohesion-Tension Theory
transpiration draws H2O from leaf
cohesion/adhesion draw water up xylem
negative H2O potential draws water into roots
in xylem
Translocation
sucrose transported from mesophyl in leave
to companion cells
to seive tube element
lowers H2O potential
H2O enters phloem
positive pressure forces sucrose/H2O to roots
in phloem
Phototropism