37. Plant Sensation and Response
Tropisms and Hormones
Multiple Choice
Multiple ChoiceIn the autumn, the amount of __________ decreases, rendering the cells of the abscission layer more sensitive to __________.
A
ethylene; auxin
B
gibberellin; abscisic acid
C
cytokinin; abscisic acid
D
gibberellin; auxin
E
auxin; ethylene
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