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Responses and Growth

Ch 3 L 5

QuestionAnswer
Tropism The response of a plant toward or away from a stimulus.
Hormone A chemical that affects growth and development. The chemical product of an endocrine gland.
Photoperiodism A plant’s response to seasonal changes in the length night and day.
Critical night length the number of hours of darkness that determines whether or not a plant will flower.
Dormancy A period of time when an organism’s growth or activity stops.
What are the 3 stimuli that produce plant responses Photoperiodism, dormancy, and tropisms.
Give a example of positive and negative tropism Positive- leaves going to the light… negative- leaves going away from the darkness.
What triggers a plant to flower the amount of darkness it gets.
Created by: user-1915469
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