Multiple choice

The outer walls of guard cells are

  1. thick and rigid

  2. thin and elastic

  3. smooth walled and multinucleate

  4. pagged and coenocytic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Guard cells have thin and elastic outer walls and thick inner walls. When turgid, the thin outer walls stretch and bulge outward, opening the stomatal pore. This asymmetric thickening is essential for stomatal opening and closing.

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