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8.5
| Term | Definition |
|---|---|
| tropism | the growth response of a plant toward or a way from a stimulus. |
| hormone | a chemical in an organism that produces a specific effect such as growth or development |
| auxin | a plant hormone that speeds up the rate of growth of plant cells. |
| photoperiod | a plant's response to seasonal changes in length of night and day. |
| short-day plant | a plant that flowers when the nights are longer than the plants critical night length. |
| long-day plant | a plant that flowers when the nights are shorter than the plants critical night length. |
| critical night length | the number of hours of darkness that determines whether or not a plant will flower |
| day-neutral plant | a plant with a flowering cycle that is not sensitive to light and dark. |
| dormancy | a period when an organisms growth or activity stops. |
| annual | a flowering plant that completes its life cycle in one growing season |
| biennial | a flowering plant that completes its life cycle in two years |
| perennial | a flowering plant that lives for more than two years 2 |
Created by:
yohali
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