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Plants Ch3 Les5

TermDefinition
Tropism The response of a plant toward or away from a stimulus
Hormone The chemical product of an endocrine gland 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
Three stimuli that produce plant responses Touch, gravity, and development are 3 important stimuli that trigger growth responses in plants
Examples of both Positive and Negative tropisms When a plant tilts toward the sun, that is a positive tropism. When plants experience gravity, they resist and grow upward still, a negative tropism
What triggers a plant to flower The amount of darkness a plant receives Determines the time of flowering in many plants
The reason why dormancy is important Dormancy helps plants survive freezing temperatures and the lack of liquid water
Created by: QuincyMcRowe
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