... respiration and photosynthesis. So somehow they need to take it up from the environment surrounding them. They do this using the small hair-like fibres on the roots. These hairs sense water and then the water is drawn up through the Xylem and Phloem cells in the shoot of the plant and distributed around the plant to where it is needed. Why plants need water The transpiration stream is the process by which water moves through a plant. Plant cell Why do plants need water? * To keep the leaves cool. * To transport material - Minerals e.g. Magnesium, Nitrogen, * In Photosynthesis to produce Glucose. * To keep cells firm and the plant rigid. * Supports the plant. Osmosis Osmosis is a type of diffusion. It is the movement of water through a semi permeable membrane, separating solutions of different concentrations. The water passes from a region of high concentration (of water) to a region of low ...

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