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Chapter 3 plants

Lesson 5

TermDefinition
Tropism The response of a plant toward or away from a stimulus.
Hormone 1. A chemical that affects growth and development. 2. The chemical product of an endocrine gland.
Photoperiodism A plant’s response to seasonal changes in the length of day and night.
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 1. Touch 2. Light. 3. Gravity.
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 is dormancy important? Dormancy helps plants survive freezing temperatures and the lack of liquid water
Created by: user-1995236
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