Water flow through plants
- Created by: Jo Wells
- Created on: 11-04-13 11:36
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- Water flow through plants
- phloem tubes
- transport food
- made in the leaves to the growing regions (e.g. new shoots) & storage organs (e.g. root tubers)
- in both directions
- made of columns of living cells
- with small holes in the ends - to let things to flow through
- transport food
- xylem tubes
- take water up
- from the roots to the stem & leaves in the transpiration stream
- made of dead cells joined end to end with no end walls between them - a hole down the middle
- take water up
- transpiration = water loss from plant
- is caused by the evaporation & diffusion of water from inside the leaves
- creates slight shortage of water in the leaf - so more water is drawn up from rest of plant through xylem vessels to replace it
- this in turn means more water is drawn up from roots = constant transpiration stream
- is a side -effect of the way leaves are adapted for photosynthesis
- they need stomata to exchange gases easily & as there is more water inside the plant than outside the water escapes
- phloem tubes
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