As I prepare to head up to my campus to test out Brad Williamson's floating leaf disk assay lab for photosynthesis lab before my kids do it tomorrow (!), I was wondering something. How many of you have your kids do alternatives to the CB's 12 labs (which I affectionately call the "dirty dozen")? During my first year teaching AP, I did every lab by the lab manual's instructions. After a year of that, I ditched some of the labs in the manual in favor of others that taught the same concepts but which were accomplished in different ways. To wit:
Instead of the 20-page diffusion/osmosis lab, my kids do the water potential portion (potato cores) of the original, and we couple it with a probeware exploration of factors affecting diffusion rate that uses a conductivity probe and dialysis tubing with salt solutions of varying concentration.
What alternatives do you all do, and which ones have you found great success with? We're about to do the FLDA in place of the DPIP lab, as I have struggled to get the DPIP one to work in the past--it's been hit and miss, lately mostly miss. So I'm hoping the FLDA works beautifully...wish me luck! I'm attaching the lab we'll be doing tomorrow in case anyone is interested.