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Plant Reproduction

Ch. 3 L 5

TermDefinition
Tropism The response of a plant toward or away from a stimulus
Hormone 1. A chemical that affects growth and development. (120) 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 three stimuli that produce plant responses? Touch, gravity, and light are three important stimuli that trigger growth responses, or tropisms, in plants
Give an example of positive and negative trophisim. If a plant grows toward the stimulus, it is said to show a positive tropism. If a plant grows away from a stimulus, it shows a negative tropism
What triggers a plant to flower? The amount of darkness a plant receives determines the time of flowering in many plants
Created by: user-1915034
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