Subject: How can I change the amount of carbon dioxide a plant receives?

Hi!

I teach 7th grade science and my students will soon be planting 
Wisconsin Fast Plants.  They would like to know the effect of 
increased levels of carbon dioxide on plants.  I don't know how to 
increase the level of CO2 without affecting other variables.  I also 
don't have many resources or much money.   Do you have any ideas?  I 
thought about using clear plastic soda bottles to cover the plants and 
generating CO2 with vinegar and baking soda.  If you have any ideas I 
would be really grateful.

Ellen Garcia

Re: How can I change the amount of carbon dioxide a plant receives?