Easy experiment conducted anywhere there is a patch of grass to demonstrate that water vapor is given off during photosynthesis. Extension...place a glowing splint in the jar an hour later & when it re-lights demonstrates oxygen is also produced.
Bottle Ecosystem, This is the most awesome class idea to teach ecosystems! Its self contained and you can observe the activity for the rest of the year. No mess no fuss and all of this cost about 17 dollars.