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How do root hairs contribute to the working of a root?
AThey shield the tip from abrasion by soil
BThey anchor the root firmly against pulling
CThey store starch made in the leaves above
DThey increase surface area for absorption
Answer & Solution
Correct answer: D. They increase surface area for absorption
1. Root hairs are extensions of root epidermal cells.
2. They increase the surface area of the root.
3. That extra area greatly increases the absorption of water and minerals.
4. Protection of the tip is the job of the root cap, so the first option names a different structure.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.3 Roots_
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