B2 T2 osmosis and transpiration

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Osmosis is the movement of water molecules across a partially permeable memebrane from a region of high concentration to a region of low concentration. A partially permeable membrane is something with very small holes in it so only water and other small molecules can pass though it.  (http://keepinapbiologyreal.wikispaces.com/file/view/osmosis.gif/165682427/osmosis.gif)

Water uptake and loss in plants

Plant roots are covered in millions of root hairs which give


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