Which of the following is not a method plants use to combat invaders?

Name: Which of the following is not a method plants use to combat invaders?
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Question

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Guard cells are not a method plants use to combat invaders. Guard cells are responsible for regulating gas exchange in plants by controlling the opening and closing of stomata. Silica crystals, trichomes, thorns, and tough bark are all physical defenses that plants can use to discourage or prevent herbivory or pathogen attacks.

Which of the Following Is Not a Method Plants Use