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Chapter 3

chapter 3 lesson 5 science notecards

TermDefinition
Tropism The response of a plant toward or away from a stimulus.
Hormone A chemical that affects growth and development.
Photoperiodism A plants 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
Give an example of both positive and negative tropism. 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.
Describe what triggers a plant to flower. The amount of darkness a plant receives determines the time of flowering in many plants.
Why dormancy is important. Dormancy helps plants survive freezing temperatures and the lack of liquid water.
Created by: user-1996767
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