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Plant growth

Ch 3 L5

QuestionAnswer
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.
3 stimuli that produce plant responses. Touch, gravity, and light.
Positive and negative tropism. Positive tropism is where a plant turns toward the sun and negative tropism is where a plant turns toward the stimuli.
What triggers a plant to flower. The amount of darkness a plant receives.
Created by: user-1915463
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