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    Biology Today and Tomorrow with Physiology Study Set 3
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    Exam 28: Plant Reproduction and Development
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    What Is the Principal Substance That Mediates Phototropism in Stems
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What Is the Principal Substance That Mediates Phototropism in Stems

Question 22

Question 22

Multiple Choice

What is the principal substance that mediates phototropism in stems?


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

Correct Answer:

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