Human Anatomy & Physiology (11th Edition)
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ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Transcribed Image Text:3. Based on the graph below, which is true about how root growth is affected by auxin concentrations?
**Graph Explanation:**
The graph is titled "Effects of Hormone Concentration on Plant Growth" and depicts the growth response of stems and roots to varying concentrations of auxin, measured in particles per liter.
- The x-axis represents the "Increasing Auxin Concentration (particles/L)" on a logarithmic scale ranging from \(10^{-1}\) to \(10^{11}\).
- The y-axis indicates the growth effect, with "promotes" at the top and "inhibits" at the bottom.
Two curves are shown:
- The blue curve represents the growth response of "Roots."
- The red curve represents the growth response of "Stems."
**Curve Descriptions:**
- *Roots (Blue Curve):*
- At low auxin concentrations, root growth is promoted.
- As auxin concentration increases, root growth is inhibited, showing a downward trend.
- *Stems (Red Curve):*
- At low auxin concentrations, there is minimal stem growth.
- As auxin concentration increases, stem growth is greatly promoted, showing an upward curve.
**Options:**
A) Root growth slows down as auxin concentrations get higher
B) Roots are growing at their highest rate as auxin concentrations get higher
C) Root growth causes auxin concentrations to decrease
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