Epidermal Tissue · Botany

Why do guard cells open the stomatal pore when they become turgid?

  1. Their unevenly thickened walls cause them to bend apart
  2. Their nuclei divide rapidly and pull the pore fully open
  3. Their cuticle dissolves completely
  4. Their chloroplasts turn into root hairs
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Correct answer: Their unevenly thickened walls cause them to bend apart

Guard cells have unevenly thickened cell walls, with the inner walls usually thicker than the outer walls. When the cells become turgid, they curve away from each other and open the stomatal pore.

Difficulty: Medium Question 6 of 20

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