A scientist plants seedlings in different conditions to demonstrate how plants respond to their environment. Which of these observations provides evidence of gravitropism?
a
Seedlings planted in containers that are tipped over sideways grow sideways.
b
Seedlings planted in containers that are tipped over sideways extend their roots downward.
c
Seedlings planted near a stick wrap around the stick.
d
Seedlings planted away from a source of sunlight grow toward the light.
b
Seedlings planted in containers that are tipped over sideways extend their roots downward.