Simple examples of the effects can be seen on simple life forms. Even plants can be used. Greater insight into these effects may help us to better understand human and pet behavior as well as crop circle development under direct contact with real flying saucers. Other types of currents like Eddie currents may also be tested.
Vines make an excellent choice.
Depending on AC rates and duty cycles these plants should grow strangely. DC current may alter the movements of small insects like mites at angles very near the charged wire. Larger scale experiments require advanced equipment and testing. I propose that in addition to electric propulsion systems testing that biological tests of this kind can be conducted along side them since the propulsion systems will effect the area near the testing zone. Periodic Testing maybe useful in relation to health and safety concerns for the lab workers.