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8.5

TermDefinition
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