Root Anatomy · Botany

Which statement best explains why the root cap must be continuously renewed?

  1. It becomes secondary xylem during root growth
  2. It opens and closes stomata in the root tip
  3. It gradually changes into phloem fiber tissue after absorbing soil minerals
  4. Its outer cells are worn away as the root grows through soil
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Correct answer: Its outer cells are worn away as the root grows through soil

The root cap is exposed to friction as the root tip pushes through soil. Its outer cells are damaged or sloughed off and must be replaced by new cells from the meristem.

Difficulty: Medium Question 18 of 18

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