25: Plant transport systems (xylem)

how do animal cells prevent rupturing by over-influx of ions?

possess a semi-permeable membrane and continually excrete solute ions

hypertonic solution

solute concentration is greater than that inside the cell, cell loses water and shrink

isotonic solution

solute concentration is equal to the solute concentration inside a cell, water moves in and out

hypotonic solution

solute concentration is less than that inside the cell; cell gains water and burst

turgor pressure

hydrostatic pressure that develops within the plant

average pressure inside a plant cell

1-2 MPa

Public Enemy No.1 (plant)

Japanese Knotweed

Japanese knotweed can extend up to ___m deep and __m in all directions, at a rate of __cm per day

Japanese knotweed can extend up to _3m deep and 7m in all directions, at a rate of 10cm per day

3 multiple choice options

leaves can be ___% air by volume

80-90%

symplast

interconnecting cytoplasm via plasmodesmata

apoplast

interconnecting cell walls

plant transport pathways

- symplast

- apoplast

- gas-filled intercellular spaces

apoplast is a ______ resistance pathway

low

symplast is a _____ resistance pathway

high

chemical potential of water

movement of water molecules in response to a gradient in free energy