S 1. affects behavior of an organism
2. response of a plant to a stimulus
3. grow away from
a. negative tropism
b. plant hormones
c. gravitropism
:.:
4. grow toward
d. ethylene gas
5. response of plants to light
6. response of plants to gravity
· e. photoperiodism
f. phototropism
ug. stimulus
7. flowering response to changes in the lengths
of light and dark in a day
h. tropism
8. control plant tropisms
i. positive tropism
9. causes fruit to ripen​