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Plant Responses grow

Ch.3 L5

TermDefinition
Tropism The response of a plant toward or away from the 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 organisms growth or activity stops.
Tell the three stimuli that produce plant responses. Touch, gravity, and light
Give an example of positive and negative tropism. If a plant grows toward the stimulus it is a positive tropism. If a plant grows away from the stimulus it shows negative tropism.
Tell what triggers a plant to flower. The amount of darkness a plant receives determines the time of flowering in many plants.
Created by: user-1915737
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