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1Define tropism.


2In today's lab you will study phototropism and thermotropism.
A)True
B)False


3Plant growth and development are controlled by internal chemical signals called ________.
A)growth stimuli
B)tropisms
C)messengers
D)growth regulators


4How is phototropism measured in this lab exercise?
A)curvature of shoots
B)height of plants
C)enlargement of leaves
D)elongation of roots


5Roots exhibit gravitropism and stems exhibit gravitropism.


6In the seed germination experiment, dormancy is broken by light absorption by ________.
A)photosome
B)photochrome
C)phytochrome
D)polychrome


7All plants need light to germinate.
A)True
B)False


8 occurs when seedlings do not receive light and the plant appears pale and their stems elongate.


9List three macronutrients of plants.


10List three micronutrients of plants.


11Plants need all the macronutrients and micronutrients to grow.
A)True
B)False


12Commercial fertilizers contain which three primary nutrients?


13Auxin promotes apical dominance.
A)True
B)False


142,4-dichlorophenoxyacetic acid is a synthetic auxin frequently used as a herbicide. How does this synthetic auxin kill plants?


15What are the dependent and independent variables in the gibberellic acid experiment?





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