Gosh, was a long time ago now.
They did it for Biology. Had to give a presentation, oral and visual.
Not sure if they saved their photos. They may have done that. I'll ask them when they wake up. Monday morning here.

Are you in a very hot climate? I would imagine that the tin foil would make the plants burn if it was too hot. It would work well stopping moisture from evaporating... a little like a mulch.