# Biology coursework helpWatch

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#1
could anyone please tell me what shape the graph should be? I got a graph tht starts to slope down then goes back up again (with concentration on the x axis and the mass on the y axis). If my graph is correct why does the graph go back up again at the end?
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15 years ago
#2
(Original post by ExplosiveFly)
could anyone please tell me what shape the graph should be? I got a graph tht starts to slope down then goes back up again (with concentration on the x axis and the mass on the y axis). If my graph is correct why does the graph go back up again at the end?
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#3
thats a good point... osmosis in potatoes
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#4
well, we put the potatoes into solutions with different concentrations to see how osmosis changes the mass of the potato...
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15 years ago
#5
(Original post by ExplosiveFly)
well, we put the potatoes into solutions with different concentrations to see how osmosis changes the mass of the potato...
i did this one actually for my gcse...let me just check how my graph went!
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15 years ago
#6
(Original post by Tazzie)
i did this one actually for my gcse...let me just check how my graph went!
my graph went down all the way!...i dont know why your graph went back up...what concentrations did u do?
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15 years ago
#7
(Original post by ExplosiveFly)
could anyone please tell me what shape the graph should be? I got a graph tht starts to slope down then goes back up again (with concentration on the x axis and the mass on the y axis). If my graph is correct why does the graph go back up again at the end?
i reckon the graph could do that

because when the concentration inside the solution is low, water will move out of the cell and into the solution, due to osmosis thereofre decreasing the mass.
and as the concentration of the solution increases, water will move into the cell due to osmosis increasing the mass...so yes ure graph is right!
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15 years ago
#8
Not supposed to go back up.
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#9
(Original post by 2776)
Not supposed to go back up.

hmm... i'm confused - so is my graph wrong or right
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15 years ago
#10
at low concentrations the concentration outside will lower than inside so water will flow out from the potato reducing the mass. When the conc. outside = conc. inside the mass of the potato will be equal to the mass of the potato out of the water. then as the conc outside increases the mass increases as water will flow in from outside. however it will stop at at point since the potato will become saturated.
this means the shape of the curve will be.......(thinks about it as has little knowledge of bio).....strange.
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15 years ago
#11
(Original post by ExplosiveFly)
hmm... i'm confused - so is my graph wrong or right
Its wrong. Its supposed to go tangential at best.
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#12
oh ok, an anomalie then? thanks very much - hey do you think i shud make up a result?
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15 years ago
#13
(Original post by ExplosiveFly)
oh ok, an anomalie then? thanks very much - hey do you think i shud make up a result?
If the anomaly is way off then try and make it look less prominent. If you are drawing a line of best fit then make the gradient less steep or something. Do you know why this anomaly occured? Manual incompetence is not a good/acceptable reason. If you otherwise have 'perfect' results (which I doubt) then keep the anomaly because you have to write about inaccuracies/amendments in your evaluation. Nevertheless, either way, to gain a mark you must state whether you have any anomalous results.
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#14
(Original post by Lucy)
If the anomaly is way off then try and make it look less prominent. If you are drawing a line of best fit then make the gradient less steep or something. Do you know why this anomaly occured? Manual incompetence is not a good/acceptable reason. If you otherwise have 'perfect' results (which I doubt) then keep the anomaly because you have to write about inaccuracies/amendments in your evaluation. Nevertheless, either way, to gain a mark you must state whether you have any anomalous results.
ok thanks - well i'm not too sure why it's occurred but i'm sure i can make up a reason - so it has to be specific... something like i timed it incorrectly or something. it's strange though - i've asked my friend and he showed me his results which had the same type of anomalie where it makes the graph go up at the end slightly
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