• List the environmental stimuli to which plants respond for each type of tropism.
• Explain the current hypotheses regarding auxins and their function in phototropism and gravitropism.
• Describe two types of nastic movements, and explain how they help a plant survive.
vocabulary tropism phototropism solar tracking thigmotropism gravitropism chemotropism nastic movement thigmonastic movement nyctinastic movement figure 31-5
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