During a severe drought, a plant prevents excessive water loss by closing its stomata. Which hormone mediates this stress response?
Q1. During a severe drought, a plant prevents excessive water loss by closing its stomata. Which hormone mediates this stress response?
Answer: Abscisic acid
Explanation: Abscisic acid (ABA) promotes stomatal closure during water stress. Ethene is tempting but is primarily involved in fruit ripening.