Diffusion of water molecules through a semi permeable membrane from a higher concentration to a lower concentration until the concentration on both sides is equal.
Osmosis in animal cells:
The cell membrane is the partially permeable membrane in animal cells. If the cells were placed in distilled water they gain water, swell and burst. This is known as haemolysis.
Osmosis in plant cells:
The cellulose cell wall of plant cells is fully permeable. Therefore it’s the cell membrane of a plant cell which acts as the semi-permeable membrane, deciding what gets into and out of the cell.
When plant cells are placed in water the following happens:
• Water enters the cell, the reason is that the cell sap in the permanent vacuole is concentrated and therefore has a low water concentration compared to the water on the outside of the cell.
• The cellulose cell wall stretches slightly but most importantly it prevents the cell bursting. (Plant cell is turgid)
• The permanent vacuole fills with water, pushing the cytoplasm against the cell ...
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- Experiment to Investigate Osmosis in Potatoes The aim of this experiment is to investigate the movement of water in and out of plant cells. The cells chosen for study will be taken from potato tubers. Firstly I will explain what osmosis is. Osmosis is the passage of water from a region of high water concentration through a semi permeable membrane to a region of low water concentration. This definition contains three important statements: a) It is the passage of water through a semi permeable membrane b) It is the passage of water from a region of high water concentration c) It is the passage of water to a region of low water concentration.... [tags: GCSE Biology Osmosis Coursework]
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