Question

Abscisic acid treatment results in ..................

• A. Leaf expansion
• B. Stem elongation
• C. Stomatal closure
• D. Root elongation

Answer 1

The correct option is C Stomatal closure

ABA inihibits the H+/K+ exchange and promotes the leakage of maleic acid. The reduction of osmotically active solutes would render the guard cells flaccid and keep the stomatal pore closed. ABA is a growth inhibitor which retards or suppresses growth and metabolism. It induces bud dormancy in a number of plants. In perennial plants, ABA causes the active axillary buds to become dormant

So, the correct answer is 'Stomatal closure'