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Plant Responses and

Growth; Chapter 3 Lesson 5

TermDefinition
Tropism The response of a pGint toward or away from a stimulus.
Hormone A chemical that affects growth and development.
Photoperiodism A plant’s response to seasonal changes in the length of 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 three stimuli that produce plant responses? The three types of stimuli are touch, gravity and light.
What is and example of a positive and negative tropism? An example of a positive tropism is when the plant turns toward the stimuli and a negative tropism is when the plant turns away from the stimuli.
What triggers a plant to a flower? The number of hours of darkness that determines whether or not a plant will flower.
Created by: user-1915164
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