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    Exam 38: Plant Developmental Responses to External and Internal Signals
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    Which Hormone Promotes Stem Elongation and Was First Discovered While
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Which Hormone Promotes Stem Elongation and Was First Discovered While

Question 54

Question 54

Multiple Choice

Which hormone promotes stem elongation and was first discovered while studying the growth of extremely tall and spindly rice plants?


A) abscisic acid
B) auxin
C) cytokinin
D) ethylene
E) gibberellin

Correct Answer:

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