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CK-12 Foundation
Ck 12: Life Science: Tropisms
[Free Registration/Login may be required to access all resource tools.] Plants may not be able to move, but they are able to change how they grow in response to their environment. Growth toward or away from a stimulus is known as a...
BBC
Bbc: Gcse Bitesize: Plant Hormones
Plants produce hormones and respond to external stimuli, growing towards sources of water and light, which they need to survive. Read about tropisms and auxins that are used to control growth in plants. There is a quiz at the end.
CK-12 Foundation
Ck 12: Biology: Plant Responses
[Free Registration/Login may be required to access all resource tools.] Describes ways that plants respond to environmental stimuli.
CK-12 Foundation
Ck 12: Third Grade: Life Science: Plant Adaptations to Environmental Changes
[Free Registration/Login may be required to access all resource tools.] Discuses how plants respond to changes in their environment and some special adaptations in plants.