Phototropism refers to how plants grow in response to light.
Gravitropism refers to plants ability to shoot their roots down and their leaves and stems up.
We wanted to test which had a stronger influence on the stems and leaves by only giving a plant light from below.
Step 1: Materials Needed
- 2 large upright boxes.
- 2 50 watt LED lights with wall plugs.
- 1 milk crate.
- Hot glue gun and glue.
- Exacto knife
- Plexiglass or greenhouse wall material.
- 2 clear drip trays.
-2 plants of the same variety.
Step 2: Step One
Place the milk crate under the box with the light underneath it so it can stand up properly. Feed the cord through the holes in the crate so you can plug it in.
Step 3: Step 2
Step 4: Step 3
After that you should be ready to plug in the lights and place your plants and drip trays in the boxes.
Step 5: Step 4
Step 6: End Notes
We observed that over the course of a month the control plant grew normally and the test plants leaves began to grow close to the main stem. The control plants leaves moved to be vertical and faced the sides of the box to catch the light coming up.
A recommendation is also to paint the inside of the boxes flat black to reduce reflection.
Also try to use quick growing young plants for more visible results.