Effect of electricity on plant growth
The hypothesis that radish seeds induced with DC electric voltages will grow more quickly, is proven to be true.
Many electroculture experiments are being done in laboratories to show that introducing an electric or magnetic field will enhance plant growth and seed germination. This method can be used in plant nurseries to improve the yield of plants being nurtured.
Try to repeat the science project experiment by comparing the growth rate using different voltages like DC6V or DC12V.
The experiment can also be done by changing length of time of exposure to the DC current and comparing plant growth.
Electricity may play a role in plant growth - http://www.nytimes.com/1985/04/09/science/electricity-may-play-role-in-plant-growth.html
Electricity to induce plant growth - http://www.thehindu.com/thehindu/2000/03/30/stories/08300009.htm
What effect on plant metabolism and growth does electricity have? http://www.madsci.org/posts/archives/jun99/927642916.Bt.r.html
Be careful when handling batteries and electric currents. Adult supervision recommended