Question

Abscisic acid regulates

• A. Shoot elongation
• B. Cell elongation and cell wall formation
• C. Cell division
• D. Leaf fall and dormancy

Answer 1

The correct option is D Leaf fall and dormancy

Abscisic acid regulates leaf fall and dormancy.

Other functions of abscisic acid includes:

1. It induces bud dormancy in a number of plants. In perennial plants, ABA causes the active axillary buds to become dormant.
   
2. It maintains dormancy in many seeds.
   
3. It inhibits mitosis in vascular cambium.
   
4. It accelerates senescence in leaves.
   
5. It functions as a stress hormone by inducing a temporary closure of stomata, to tide over adverse environmental conditions.
   
6. It promotes abscission of leaves, flowers and fruits in most of the plants.
   
7. It inhibits seed germination.
   
8. It delays cell division and cell elongation.
   
9. It promotes rooting of stem cuttings in some plants like ivy and bean.
   
10. It inhibits flowering except in some short day plants where it promotes flowering.