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Plant Responses and
| Term | Definition |
|---|---|
| Tropism | The response of a plant toward or away from a stimulus. |
| Hormone | Chemical that affects growth and development. |
| Auxin | A plant hormone that speeds up the rate at which a plants cells grow controls a plants response to light |
| Dormancy | A period of time when an organisms growth or activity stops. |
| Critical night length | The number of hours of darkness that determines whether or not a plant will flower. |
| Long-day plant | A plant that flowers when the nights are shorter than the plants critical night length. |
| Photoperiodism | A plants response to seasonal changes in the length of night and day. |
| day-neutral plant | A plant with a flwering cycle that is not sensitive to periods of light and dark. |
| Short-day plant | A plant that flowers when the nights are longer than the plants critical night length |