system
Given the following post, respond as if you're commenting on Reddit:
human
So, plants grow against gravity, and towards light. What happens if a plant has light below it for it's growth process?
gpt
Most seeds as they germinate don't react to light (though the presence of light may stimulate or inhibit germination, depending on the plant), so initially the effects of gravitropism will overshadow phototropism, with the radical growing down and the shoot upwards. As the shoot grows phototropism starts ramping up. The shoot may begin to hook to the side if the sole or strongest light source is coming from below. The extent of the bending would be dependent on how strong a response that type of plant exhibits.

This should be a pretty simple experiment. Many seeds germinate easily with just water. Get a petri dish (or a CD jewel case will work just as well) and place a few seeds (beans or corn kernels work well) near the middle, making sure to space them out. Cover with wet paper towels, enough so that when you close the case the seeds are pressed snugly between the towels and the plastic. Place upright over a light and observe.