1. Science 7—Chapter 8 Plant Processes an Reproduction
Lesson 2
Plant Responses

2. plant hormones produced by root tips that increase the rate of cell division

3. cytokinins
plant hormones produced by root tips that increase the rate of cell division

4. plant hormone that helps stimulate the ripening of fruit

5. ethylene
plant hormone that helps stimulate the ripening of fruit

6. any changes in an organism’s environment that cause a response

7. stimulus
any changes in an organism’s environment that cause a response

8. the response of a plant to gravity

9. gravitropism
the response of a plant to gravity

10. a plant’s response to the number of hours of darkness in its environment

11. photoperiodism
a plant’s response to the number of hours of darkness in its environment

12. plant hormones that increase the rate of cell division and cell elongation

13. gibberellins
plant hormones that increase the rate of cell division and cell elongation

14. the response of a plant to touch

15. thigmotropism
the response of a plant to touch

16. a response that results in plant growth toward or away from a stimulus

17. tropism
a response that results in plant growth toward or away from a stimulus

18. plant hormone responsible for phototropism

19. auxin
plant hormone responsible for phototropism

20. the growth of a plant toward or away from light

21. phototropism
the growth of a plant toward or away from light