Section 2

objectives

• 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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