Osmosis Data Analysis
Introduction:
My aim to find out when the sugar solution’s concentration is high or low it will expand or reduce. Plant cells always have a strong cell wall surrounding them. When the take up water by osmosis they start to swell, but the cell wall stops them from bursting. When they are put in dilute solutions, plant cells turn out to be “turgid” (swollen and hard). When the pressure inside the cell increases; No more water can’t enter the cell because the internal pressure of the cell is really high.
“When plant cells are placed in concentrated sugar solutions they lose water by osmosis and they become “flaccid”; this is the exact opposite of “turgid”. If you put plant cells into concentrated sugar solutions and look at them under a microscope you would see that the contents of the cells have shrunk and pulled away from the cell wall: they are said to be plasmolysed.”
When plant cells are placed in a solution which has exactly the same osmotic strength as the cells they are in a state between turgidity and flaccidity. We call this incipient (about to be) plasmolysis. Although their cells are not plasmolysed, they are not turgid and so they do not hold the leaves up into the sunlight. (7)
If red blood cells are placed in a solution with a lower solute concentration than is found in the cells, water moves into the cells by osmosis, causing the cells to swell; such a solution is hypotonic to the cells. When red blood cells are placed in pure water, water rapidly enters the cells by osmosis and causes the cells to burst, a phenomenon known as haemolysis. If the red blood cells are placed in a solution with a higher solute concentration, water moves out of the cell by osmosis. (8)
**When the osmotic pressure of the solution outside the blood cells in higher than the osmotic pressure inside the red blood cells, the solution is hypertonic. When the solution outside of the red blood cells has a lower osmotic pressure than the cytoplasm of the red blood cells, the
My aim to find out when the sugar solution’s concentration is high or low it will expand or reduce. Plant cells always have a strong cell wall surrounding them. When the take up water by osmosis they start to swell, but the cell wall stops them from bursting. When they are put in dilute solutions, plant cells turn out to be “turgid” (swollen and hard). When the pressure inside the cell increases; No more water can’t enter the cell because the internal pressure of the cell is really high.
“When plant cells are placed in concentrated sugar solutions they lose water by osmosis and they become “flaccid”; this is the exact opposite of “turgid”. If you put plant cells into concentrated sugar solutions and look at them under a microscope you would see that the contents of the cells have shrunk and pulled away from the cell wall: they are said to be plasmolysed.”
When plant cells are placed in a solution which has exactly the same osmotic strength as the cells they are in a state between turgidity and flaccidity. We call this incipient (about to be) plasmolysis. Although their cells are not plasmolysed, they are not turgid and so they do not hold the leaves up into the sunlight. (7)
If red blood cells are placed in a solution with a lower solute concentration than is found in the cells, water moves into the cells by osmosis, causing the cells to swell; such a solution is hypotonic to the cells. When red blood cells are placed in pure water, water rapidly enters the cells by osmosis and causes the cells to burst, a phenomenon known as haemolysis. If the red blood cells are placed in a solution with a higher solute concentration, water moves out of the cell by osmosis. (8)
**When the osmotic pressure of the solution outside the blood cells in higher than the osmotic pressure inside the red blood cells, the solution is hypertonic. When the solution outside of the red blood cells has a lower osmotic pressure than the cytoplasm of the red blood cells, the
References: (9) http://people.usd.edu/~bgoodman/Osmos.htm ( 9th December 2012 19:15) (10) http://www.bbc.co.uk/schools/gcsebitesize/science/add_gateway_pre_2011/greenworld/waterrev1.shtml (29th November 2012)