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Osmosis Coursework

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Introduction

Osmosis in potatoes Problem: Investigation on how changing concentration of Sucrose effects osmosis in potatoes. Scientific Knowledge To understand osmosis, we first need to understand diffusion as osmosis is a special type of diffusion. Diffusion is when gas particles move at random from where they are in high concentration to where they are in a lower concentration, until the particles are evenly spread. ...read more.

Middle

Semi-permeable Membrane The water molecules will move to the left through the semi-permeable membrane to where the water is less concentrated. When this happens, the membrane will look like this; The water has evenly spread between both sides of the membrane The movement of water will stop when the concentration of water on either side of the membrane is equal. To Recap: In the above diagrams, pure water and strong sugar solution are separated by a semi-permeable membrane. ...read more.

Conclusion

water will leave the cell, to where water is less concentrated in the sugar solution. This will cause the cell to lose mass. As water leaves the cell, it will be at incipient plasmolysis. A cell at this stage will look like this; * The cell membrane has moved away from the cell wall as the vacuole loses water. * Cell wall becomes softer and is described as being flaccid. When all the water has left, we can say it is fully plasmolysed. ?? ?? ?? ?? Nathan Bennett - D6 ...read more.

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Response to the question

This piece of coursework offers a basic understanding of osmosis, addressing the knowledge required in basic terms. Yet, it does not sufficiently engage with the question. The question implies that data should be collected first, experimenting with varying concentrations of ...

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Response to the question

This piece of coursework offers a basic understanding of osmosis, addressing the knowledge required in basic terms. Yet, it does not sufficiently engage with the question. The question implies that data should be collected first, experimenting with varying concentrations of sucrose. If this piece had data to display the trends claimed, it would be easier to answer the question. It is also key to note that the question refers to potatoes - in this case, it is recommended to place the question in context: potatoes are not mentioned once in this piece.

Level of analysis

The analysis of osmosis is basic. It would be recommended to discuss the movement of water molecules in reference to water potential: water molecules move from an area of high water potential to an area of low water potential, down the water potential gradient. Analysis such as this would be key to accessing higher marks. Without the use of data and graphs, there is little analysis in this piece. If a set of data was collected, a sucrose concentration could have then be identified where the potato has no net gain in weight. Displaying skills like this will show a full understanding of osmosis, whereas the knowledge here seems superficial.

Quality of writing

The style of writing is of a good standard. It is cogent and manages to convey concepts with the use of diagrams. It was pleasing to see they didn't overuse the first person. This is a common hinderance when moving from KS3 to GCSE, where students say "I am going to", "I found that" when addressing experiments.


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Reviewed by groat 03/02/2012

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