Abscisic acid causes :
Correct answer: A. Stomatal closure
- A. Stomatal closure
- B. Stem elongation
- C. Leaf expansion
- D. Root elongation.
Explanation
a) : Absisic acid is a hormone produced during adverse environmental condition. It also causes the closure of stomata under conditions of water stress as also under high concentration of CO 2 in the guard cells. Abscisic acid inhibits the K+ uptake by guard cells and promotes the leakage of malic acid. It results in reduction of osmotically active solutes so that the guard cells become flaccid and stomata get closed.
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