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Chapter 8.5

Vocabulary

TermDefinition
tropism plant's growth response toward or away from a stimulus
hormone chemical that affects how the plant will grow and develop
auxin speed up the rate at which a plant grows
photoperiodism response to seasonal changes in the length of night and day
short-day plant flowers when nights are longer than critical length
long-day plant flowers when nights are shorter than critical length
critical night length number of hours of darkness determines whether or not a plant will flower
day-neutral plants flowering cycle is no sensitive to dark or light
dormancy period when a organism's growth and development stop
annuals complete life cycle on season
biennials complete life cycle in two years
perennials flowering plants that live for more than two years
Created by: S732088
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