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Biology Coursework OSMOSIS The Oxford Dictionary defines Osmosis as "the passage of a solvent through a semi-permeable partition into another solution." In Biology, Osmosis is the process by which different water concentrations balance out between cells. The water travels through semi permeable membranes until the concentration is equal on both sides of the membrane. The large particles in the highly concentrated liquid do not pass through the semi permeable membrane, but the water molecules do. Plant cells are surrounded by a cell wall made from cellulose fibres. This wall is fully permeable to allow dissolved substances to pass through it easily. There is a thin layer under the cell wall called the cell membrane, and this is only semi-permeable so only certain substances can leave and enter the cell. Any substance dissolved in water is called a solute; a solvent is a liquid that is able to dissolve another substance, called a...

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