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Chapter 5
lesson 5 Plant responses and growth
| Term | Definition |
|---|---|
| Tropism | A plants growth response toward or away from a stimulus. |
| Hormone | A chemical that affects growth and development, the chemical product of an endocrine gland. |
| Photoperiodism | A plants response to seasonal changes in the length of night and day. |
| Critical night length | Phone number of hours of darkness that determines whether or not a plant will Flower. |
| Dormancy | A period of time when an organisms growth or activity stops. |
| List three stimuli that produce plant responses | Touch, gravity, and light or three important stimuli that trigger growth responses, or tropisms, in plants. |
| Give an example of both positive and negative tropism | If a plant grows toward the stimulus, it is said to show a positive tropism. If a plant grows away from a 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 survive freezing temperatures and the lack of liquid water. |
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