Biology Homework Help

Hi! I am doing a final diploma project about a field of science of my choice. I have been thinking about biology with focus of plant growth/photosynthesis.The idea with this project is to have a reasonable background to why it was chosen to be investigated.Now, I have been thinking of maybe exposing plants to magnetic fields (adding bar magnets to the soil). But I am unsure if its a reasonable idea. I wanted to ask if you could provide a line of science, or a dependent variable worth investigating that would not take too much time.