Hinuku Posted January 9, 2011 Report Share Posted January 9, 2011 (edited) I am writing a photosynthesis design - light intensity affects rate of photosynthesis, and I have no idea how to control the level of CO2 at exactly 0.5% (I figure that the experiment will take a short while so I'm not taking the 0.1% value). Thank you for your help, Matt Edited January 9, 2011 by Hinuku Reply Link to post Share on other sites More sharing options...
dessskris Posted January 9, 2011 Report Share Posted January 9, 2011 Keeping the plant in a closed system..? I am not too sure, though, I am not taking IB Biology (I took IGCSE Bio)If the plant is small enough you can put it in a large test tube or something.. If you want the amount of CO2 to be constant throughout the experiment I have no idea, though. Probably putting in a snail or something like that.Some more people may reply to this later though so you may wait for a better answer Reply Link to post Share on other sites More sharing options...
Hinuku Posted January 9, 2011 Author Report Share Posted January 9, 2011 Thanks a lot. I think I will be conducting the experiment on Elodea (I'm not too sure it is the best plan but I have no other ideas). Anyways, I really need a way to keep the CO2 at 0.5% or 0.1%, doesn't really matter. Designs don't eliminate any technology, but I haven't heard of any devices that could do the job. Well.. I need to wait for a more precise answer, but thanks anyways Reply Link to post Share on other sites More sharing options...
buszmen Posted January 9, 2011 Report Share Posted January 9, 2011 (edited) Why do you even want to keep the amount stable? The figures just have to be the same for each sample, so all you have to do is presume that when you carry out the experiment in the same time the CO2 level is the same in every bucket or wherever you want to keep elodea. A tak wogole Mateusz to sie uczyc a nie jakies glupoty wypisywac w internecie! Edited January 9, 2011 by buszmen Reply Link to post Share on other sites More sharing options...
Drake Glau Posted January 9, 2011 Report Share Posted January 9, 2011 CO2 levels won't be much of a problem, unless you move your plants to some other random place. If you keep the plants in your house, classroom, whatever, the CO2 levels won't change enough for it to matter. In your design you could simply state you kept the plants in the same room to control CO2 levels as best as possible. Also it would be almost impossible (even in a closed system) to keep it constant. The plant will use it up eventually so the CO2 levels will start dropping unless you add more into it which involves opening the system. So I agree with buszmen, just keep it constant, in the same place. Don't move the plants around. Reply Link to post Share on other sites More sharing options...
Sandwich Posted January 9, 2011 Report Share Posted January 9, 2011 Yeah just use atmospheric CO2. Unless you stand and breathe over one particular plant, it ought to be the same for all of them. Laws of diffusion and whatnot. Reply Link to post Share on other sites More sharing options...
Rocket-Singh Posted April 26, 2013 Report Share Posted April 26, 2013 You can try using Sodium Carbonate coz it absorbs Carbon dioxide which should probably help you in keeping its amount constant throughout the experiment...Hope this helps Reply Link to post Share on other sites More sharing options...
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