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Slide 1

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Transport in plants....…read more

Slide 2

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Plant transport systems
· Carbon dioxide!- obtain this from the air.
· Oxygen- they all need oxygen for respiration.
· Organic nutrients- many plant cells do not
photosynthesise and so need to be supplied with
nutrients from photosynthetic or storage cells.
· Inorganic ions and water- taken up from the soil by
Plants have two transport systems, one for carrying
water and inorganic ions, the other is for carrying
substances made by photosynthesis. None of the plant
transport systems carry oxygen or carbon dioxide.
These move through diffusion alone.…read more

Slide 3

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Water transport in plants
1. water uptake near root tips.
2. Water enters xylem
3. Water moves up xylem
4. Water moves from xylem to leaf cells
5. Evaporation of water into leaf air spaces
6. Transpiration of water vapour through open
stomata into air.…read more

Slide 4

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From soil into root hair
· Roots have single celled extensions of the cells
that make them up, root hairs.
· Thousands of them so provide a large surface area.
· Between soil particles there are air spaces. There is
a thin layer of water covering each soil particle.
· The water moves into the root hair because there
is a lower concentration of solutes in the soil then
there is in the root hair cell.
· The water potential outside the root hair is higher
than the water potential inside.…read more

Slide 5

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From root hair to xylem
· The water travels across the cortex and into the
centre of the root.
· The water potential in the xylem is lower then in the
root hair cells.
· The water can take two different routes through the
1. The apoplast pathway- travelling through the cell
walls of the cells.
2. The symplast pathway- travelling through the
cytoplasm of each cell by osmosis. It can also move
along strands of cytoplasm that makes connections
between adjacent cells called plasmodesmata.…read more

Slide 6

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The symplast pathway!
·Water enters the cytoplasm The apoplast pathway!
across the partially permeable
·Water enters the cell wall.
plasma membrane
·Water can move into the sap ·Water moves through the
in the vacuole, through the cell wall.
tonoplast. ·Water may move from cell
·Water may move from cell to wall to cell wall, across
cell through the intercellular spaces.
·Water may move from cell to ·Water may move directly
cell through adjacent plasma from cell wall to cell wall.
membrane cell walls.…read more

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