When plants grow, the stem and
leaves grow upward while the roots grow downward. The direction
that a plant grows has nothing to do with the way that you plant
a seed. Stems always find their way up and roots always find their
Why is that? How does the plant
know which way is up or which way is down? Is it because of soil
moisture? Light or gravity?
In this project, you will study the
effect of gravity on plant growth.