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Investigate osmotic effects on plant cells Introduction Water is not only the medium in which metabolic reactions occur but it provides skeletal support and thus is vital for plants. Animal cells are not used to demonstrate osmotic effect in this study because it would raise moral and ethical issues in regards to animal rights and the use of animals in scientific experimentation. Also animal cells don't have cell walls so if they were in dilute solutions the cell membrane would expand and eventually split. This type of change due to osmosis would be difficult to measure. A plant cell (fig 1) maintains its shape due to the cell wall being rigid and the cell wall pushing outwards onto it. Water will enter a cell by osmosis. Osmosis is the movement of water molecules from a dilute solution to a concentrated solution through a selectively permeable membrane (fig 2). When a plant cell gains water the...

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