1. Plants: Environmental Reactions Year 1 Science

2. EQ In what ways do plants react to their surroundings for the purpose of survival?

3. Table Talk With your group, discuss how the environment impacts a plant. You have 1 minute!

4. Environmental Reactions Plants respond to their surrounding environment in various ways. 2 popular ways that plants react to their environments is through dormancy and tropism.

5. Dormancy Dormancy: a period of inactivity in a seed prior to germination; seed remains dormant until conditions are good for growth and development of the new plant

6. Table Talk With your group, discuss why seeds may undergo dormancy. You have 30 seconds to discuss!

7. Tropism When plants move and grow toward or away from a stimulus Positive tropism: the plant grows toward the stimulus Negative tropism: the plant grows away from the stimulus

8. 4 Major Types of Tropisms

9. Hydrotropism The growth of a plant’s roots in response to WATER.

10. Gravitropism (Geotropism) The growth of a plant in response to GRAVITY.

11. Phototropism The growth of a plant in response to LIGHT.

12. Thigmotropism The growth of a plant in response to TOUCH or CONTACT.

13. Thigmotropism Mimosa Plant

14. Interactive Plants in Motion

15. Homework On page 12, complete the following: 1) Describe how dormancy is helpful when it comes to a seed’s survival. 2) Choose 1 tropism (phototropism, hydrotropism, or gravitropism) and illustrate a plant undergoing that tropism both negatively and positively.