Ok, this is a kind of "homework" question.
We have a paramecium and two electrodes in the water. The paramecium migrates to the cathode.
:yeah ---------------------> (-)
Then we switch the electrodes. The paramecium starts going for the cathode again, but this time he dies quickly and stops moving.
:blue:<--:yeah (+)
Anyone have an idea why? My hypothesis was that a current is created where the positive particles go to the negative pole, taking the paramecium with it or that it's the charge of the cell itself. But then it wouldn't make sense why it stops moving altogether when switching the electrodes.
Perhaps it has something to do with the electrolysis of water. H2-cathode, 02-anode.
I know it's not an everyday homework question and would probably need some actual research, but just in case somebody knows this.