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Plant Responses and

Ch 3 L5

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 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 the three stimuli that produce plant responses? Light, gravity, and water
What is an example of positive and negative tropism? Positive: growth towards a stimulus Negative: growth away from a stimulus
What triggers a plant to flower? Photoperiod and temperature
Created by: user-1915467
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