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Ch3 L5

Plant Responses and Growth

TermDefinition
Tropism A plants growth response toward or away from a stimulus is called tropism
Hormone A chemical produced by plant that affects how the plant grows and develops
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 when an organism’s growth or activity stops
Tell me the three stimuli that produce plant responses Touch, gravity, and light
Give an example of positive and negative tropism If the plant grows towards the stimulus it’s positive, if it grows away from the stimulus it’s negative
Tell me what triggers a plant to flower The amount of darkness a plant receives determines the time of flowering in many plants
Created by: user-1915592
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