Which of the following plant hormones plays a primary role in triggering K⁺ to pass rapidly out of guard cells?

Question

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The plant hormone abscisic acid plays a primary role in triggering K⁺ to pass rapidly out of guard cells, causing stomatal closure. This hormone is produced in response to stress conditions such as drought and plays an important role in plant response to water availability. None of the other plant hormones listed are known to trigger K⁺ to pass rapidly out of guard cells.

Which of the Following Plant Hormones Plays a Primary Role