Plant Adaptations · Botany

Rolling of leaves during dry conditions to protect the stomata is an adaptation found in many grasses, facilitated by:

  1. Guard cells
  2. Companion cells
  3. Subsidiary cells
  4. Bulliform cells
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Correct answer: Bulliform cells

Bulliform cells are large, motor cells in the epidermis. When they lose turgor pressure during water stress, they cause the leaf to roll inward, creating a humid micro-environment.

Difficulty: Medium Question 18 of 20

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