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8.5 science
Term | Definition |
---|---|
Tropism | a plant's growth response toward or away from a stimulus |
Hormone | chemical that effects how a plant grows and develops |
Auxin | an important plant hormone |
Photoperiodism | a plant's response to seasonal changes in night and day |
Short-day Plants | flower when nights are longer than critical length |
Long-day Plants | flower when nights are shorter than critical length |
Critical Night Length | the number of hours of darkness that determines whether or not a plant will flower |
Day-neutral Plants | flowering cycle is not sensitive to periods of light and dark |
Dormancy | a period when an organism's growth or activity stops |
Annuals | flowering plants that complete a life cycle in one growing season |
Biennials | angiosperms that complete their life cycle in two years |
Perennials | flowering plants that live for more than two years |