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Chapter3 lesson 5

Chapter 3 lesson 5

TermDefinition
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 of night and day.
Critical night length The number of of hours of darkness that determines whether or not a plant will flower.
Dormancy A period of time when an organism's growth or actively stops.
List three stimuli that produce plant responses. Touch, gravity, and light are three important stimuli that trigger growth responses.
What triggers a plant to a flower. The amount of darkness a plant receives determines the time of flowering in many plants.
Why is dormancy important. Dormancy helps plants survive freezing temperatures and the lack of liquid water.
Created by: user-1996630
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