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Anabelle
1st. Chapter 3 lesson 5
| Term | Definition |
|---|---|
| Tropism | The response of a plant toward or away from a stimulus. |
| Hormone | 1.a chemical that affects growth and development. 2.the chemical product of an endocrine gland. |
| Photoperiodism | A plant's response to seasonal changes in the length of a night and day. |
| Critical night length | The number of hours of darkness that determines whether or not a plant will flower. |
| Dormancy | A period of time when an organism's growth or activity stops. |
| List three stimuli that produce plant responses. | Touch, gravity, and light are 3 important stimuli that trigger growth responses, or tropisms, in plants. |
| Give an example of both positive and negative tropism. You may draw two. | If a plant grows towards the stimulus, it is said to show a positive tropism. If a plant grows away from the stimulus, it shows a negative tropism. |
| Describe what triggers a plant to flower. | The amount of darkness a plant receives determines the time of flowering in many plants. |
| Why dormancy is important. | Dormancy helps plants survive freezing temperatures and the lack of liquid water. |
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