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Lesson 5

Chapter 3 Lesson 5 8th period

TermDefinition
Tropism The response of a plant toward or away from a stimulus
Hormone a chemical that affects growth and development Also the chemical product of an endocrine gland
Photoperiopdism a plants 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 growth or activities stops
Three stimuli that produce plant responses Touch gravity, and light
Example of both positive and negative tropism
What triggers a plant to flower The amount of darkness a plant receives determines the time of flowering in many plants
Why Dormancy is important Dormancy helps plant survive freezing temperatures and the lack of liquid water.
Created by: user-1996761
 



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