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Chapter 3

L5

TermDefinition
Tropism The response of a plant toward or away from a stimulus
Hormone 1. A chemical that affects growth and development 2. The chemical product of an endocrine glade
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 three stimuli that produce plant responses Touch, gravity, and light are three important stimuli that trigger growth responses, or tropisms, in plants
What is an example of both positive and negative tropism If a plant grows towards a stimulus, it is said to show a positive tropism. if a plant grows away from a stimulus, it shows a negative tropism.
What triggers a plant to a flower Touch, gravity, and light are what triggers a plant to a flower
Why is dormancy important Dormancy helps plants survive freezing temperatures and the lack of liquid water
Created by: user-1996633
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