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Osmosis:Graph, Conclusion and Evaluation

Asked by Fleeties | Mar 4, 2007 | GCSE Level > Biology > Coursework
Fleeties
Ok. I have to draw up a graph for the Osmosis experiment, I think I am using either the Average mass (of 3 results) or Average Gain or loss e.g. +0.2g or -0.3 could anyone confirm this? Also which Axis should be used for the concentration? I have no idea on the Scientific theory to explain my results in the conclusion and am stuck on what to put for the conclusion and evaluation. I want really really fast replies please its in for tomorrow!!!
SZPoints: 6 | Difficulty: Hard | Comments: 6 | Answered (goto answer)

4 Comments, 1 Assist, 1 Answer

andyofdabcc, 4 Mar, 2007 @ 19:15
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andyofdabcc
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Only thing I can say is the concentration goes along the X axis, because it's something that you con control, you specify, and you know the value of before the test. 

Not too sure bout your first bit, that'll be dependant on what it says in your coursework.  Both things would be pretty useful, so just to be sure, I'd do both, then when you find out tomorrow, get rid of the other one you don't need to hand in, or maybe keep it if you think it'll get you a few extra marks. 

Evaluations, usually things that went well, things that went bad, possible improvements to your experiment, thats all i can give you really
Fleeties, 4 Mar, 2007 @ 19:22
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Fleeties
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Id still like some help with conclusion/ evaluation please!
autumn_breeze, 4 Mar, 2007 @ 20:31
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autumn_breeze
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I did the percentage loss/gain, I think.

The scientific theory is fairly easy, do you know anything about diffusion? Osmosis is the movement of water particles across a partially permeable membrane. The particles move from an area of high water concentration to an area of low water concentration. [Emphasis on water particles, not sugar/salt particles].

So, when the cells are put into the solution the water particles move accordingly. If the solution has less water particles than the cell sap in the vacuole [strong solution], then the water particles will move out, making the plant shrivel up and become flaccid.

If the solution has more water particles than the cell sap in the vacuole [weak solution], then the particles will move into the cell from the solution, making the plant cells swell up and become turgid.

Basically for the conclusion, just waffle on about the details, what solutions had the biggest effect, how to improve, keep repeating your scientific knowledge till you're sick of it. Remember to give qualitative [wordy-explanations] and quantative [stick lots of number and values in] responses to the results.

Hope that helps. Just say if there's anything else you need to know.

xichan, 4 Mar, 2007 @ 20:46
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xichan
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the theory is pretty easy, just make sure to include images of osmosis. and specify them to the experiment ur doing.

i have no idea about evaluation as i'm still stuck on analysis :S

 

autumn_breeze, 4 Mar, 2007 @ 20:48
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autumn_breeze
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Yup, graphs are very good. Search google images for some ideas. They're really simple, but can really fill up a space.
autumn_breeze, 4 Mar, 2007 @ 20:49
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autumn_breeze
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Sorry, I said graphs - I meant DIAGRAMS. Its too late, I'm going to bed.

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Martin Fleetwood
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