Kaylee Posted October 28, 2010 Report Share Posted October 28, 2010 Hi everyone,I'm still starting off in IB, so forgive me for being so confused lol. My biology teacher assigned a biology design lab write up which is due soon. It has to be relevant to the tonicity of a fruit or a vegetable. How do I go about this? Thanks in advance! Reply Link to post Share on other sites More sharing options...
Drake Glau Posted October 28, 2010 Report Share Posted October 28, 2010 Hi everyone,I'm still starting off in IB, so forgive me for being so confused lol. My biology teacher assigned a biology design lab write up which is due soon. It has to be relevant to the tonicity of a fruit or a vegetable. How do I go about this? Thanks in advance!Hmm I could be WAY over thinking this somehow, but what is tonicity exactly? Reply Link to post Share on other sites More sharing options...
ShineeLikeMe Posted October 28, 2010 Report Share Posted October 28, 2010 We're not allwoed to give you answers outright but think about what affects the tonicity of a fruit. What can you use to quantitatively measure it. What kind of solutions would the fruit react to. Stuff like that. If you need anymore help feel free to ask. Reply Link to post Share on other sites More sharing options...
Drake Glau Posted October 28, 2010 Report Share Posted October 28, 2010 We're not allwoed to give you answers outright but think about what affects the tonicity of a fruit. What can you use to quantitatively measure it. What kind of solutions would the fruit react to. Stuff like that. If you need anymore help feel free to ask.I don't see where this says IA in it, so we can give rather direct advice =/ Reply Link to post Share on other sites More sharing options...
JoeG Posted October 28, 2010 Report Share Posted October 28, 2010 Are you looking for general guidelines for a writeup? Reply Link to post Share on other sites More sharing options...
Mahuta ♥ Posted October 28, 2010 Report Share Posted October 28, 2010 Tonicity is the measure of osmotic pressure of two solutions seperated by a membrane (inside and outside of the fruit). So two solutions that are isotonic have the same osmotic pressure, or in a simpler terms, has the same concentration of water and solute.Check your book for the osmosis part, it gives you everything. A fruit is supposed to represent a cell and you want to see the reaction of the cell to different solutions. Just like the book/study guide says, you are altering the external solution.There that's the maximum I could give you, there is one more thing you need to figure out which is how to alter the external solution and that is found by reading osmosis part of your study guide/ text book. Reply Link to post Share on other sites More sharing options...
Kaylee Posted October 28, 2010 Author Report Share Posted October 28, 2010 Honestly, any help would be very much appreciated. I just don't know where to start... :/ Our teacher didn't really go over how to measure the tonicity of a fruit. I'm not sure if I'm supposed to design an experiment to measure how different substances affect the tonicity of a fruit or just the tonicity of the fruit by itself. Reply Link to post Share on other sites More sharing options...
Mahuta ♥ Posted October 28, 2010 Report Share Posted October 28, 2010 No you are not expected to MEASURE tonicity, we don't even do that in med school. As far as IB is concerned, you need to know the effects of external solution tonicity on a cell (which is demonstrated by the fruit here) Reply Link to post Share on other sites More sharing options...
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