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8.5 Science Vocab

tropism a plant's growth response toward or away from a stimulus.
hormone chemical that affects how the plant grows and develops.
auxin one important plant hormone that speeds up the rate at which a plant's cells grow.
photoperiodism a plant's response to seasonal changes in length of day and night.
short-day plants flower when nights are longer.
long-day plants flower when nights are shorter.
critical night length the number of hours of darkness that determines whether or not a plant will flower.
day-neutral plant flowering cycle is not sensitive to periods of light and dark; ex.- dandelions, rice, tomatoes.
dormancy period when an organism's growth or activity stops.
annuals flowering plants that complete a life cycle within one growing season.
biennials angiosperms that complete their life cycle in two years.
perennials flowering plants that live for more than two years.
Created by: S730503