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Plant responses

Ch3 L5

TermDefinition
Tropism The response of a plant toward or away from a stimulus.
Hormone 1. A chemical that affects growth and development. 2. 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 3 stimuli that produce plant responses? Touch, gravity, and light are three important stimuli that trigger growth responses, or tropisms, in plants.
What is an example of positive and negative tropism? Roots show positive gravitropism although, stems show a negative gravitropism.
What triggers a plant to flower? The amount of darkness a plant receives detriments the time of flowering in many plants.
Created by: user-1917207
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