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Plant responses and

Ch 3 L 5

TermDefinition
Tropism A plants growth response toward or away from a stimulus
Hormone A chemical produced by a plant that affects how the plant grows and develops
Photoperiodism a plants response to seasonal changes in the length of day and night
Critical night length The number of hours of darkness that determines whether or not a plant will flower
Dormancy a period when an organisms growth or activity stops
The three stimuli that produce plant responses Touch, gravity, light
An example of positive and negative tropism a positive tropism is when the plant grows toward the stimulus. A negative tropism is when a plant grows away from a stimulus.
What triggers a plant to flower The amount of darkness, a plant receives determines the time of flowering and many plants
Created by: user-1915456
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