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8.5 Vocab

tropism plants growth response toward or away a stimulus
hormone a chemical that effects how a plant grows
auxin speeds up the rate at which plant cells grow
photoperiodism a plant's response to seasonal changes
short day plants when nights are longer than a critical length
long day plants when nights are shorter than a critical length
critical night length number of hours of darkness that determines whether or not a plant will flower
day neutral plants flowering cycle that is not sense darkness
dormancy when a organism's growth or activity stops
annuals flowering plants that complete a life cycle in one growing season
biennials angiosperms that complete the life cycle in two years
perennials flowering plants that live more than two years
Created by: s730043