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If stomata of a plant remain open during severe water shortage, which hormone may be deficient or ineffective?

Answer and explanation

Correct answer: Abscisic acid

During severe water shortage, a plant must reduce transpiration to conserve its limited water. Abscisic acid, or ABA, is a plant hormone that promotes stomatal closure under water stress. If ABA is deficient or the guard cells do not respond to it, stomata may remain open and excessive water loss can continue. Therefore option A is correct; the other hormones are mainly associated with animals.

Related tags

Abscisic-AcidStomataWater-StressPlant-HormonesPlant HormonesControl And CoordinationScienceClass 10 Mcq

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