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.
Frequently asked questions
What is the correct answer to this question?
Abscisic acid
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Control and Coordination. Topic: Plant hormones.
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