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Ch. 3 Plants

L. 5

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
List three stimuli that produce plant responses Touch, gravity, and light
An example of both positive and negative tropism.– you may draw too Positive tropism occurs when a plant grows towards a stimulus, such as a stem bending towards light. Negative tropism happens when a plant grows away from a stimulus, like roots growing away from light
Describe what triggers a plant to flower A hormone helps trigger a plant to flower
Why dormancy is important Dormancy helps plants survive freezing temperatures and the lack of liquid water
Created by: user-1997209
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