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Lesson 5
Chapter 3 Lesson 5 note/flash cards
| Term | Definition |
|---|---|
| Tropism | The turning of all or part of an organism. |
| Hormone | A regulatory substance. |
| Photoperiodism | The response of an organism in the length of day. |
| Critical night length | The specific period of uninterrupted darkness. |
| Dormancy | A period of temporary inactivity. |
| Three stimuli that produce plant responses | Light , gravity and touch. |
| Example of both positive and negative tropism | A plant stem growing towards the light while its roots are growing away from the light. |
| What triggers a plant to flower | A combination of internal genetic programming. |
| Why dormancy is important | It helps plants and animals survive in unfavorable. |