. Abscisic acid controls
A: Cell division
B: Leaf fall and dormancy
C: Shoot elongation
D: Cell elongation and wall formation
- Abscisic acid is a sesquiterpene plant hormone that is moderately acidic.
- It serves as an inhibitor because it counteracts auxin, cytokinin, and gibberellin's growth-promoting effects while promoting seed development, maturity, and dormancy.
- Abscisic acid, which accumulates in latent buds, seeds, and other storage organs, regulates dormancy.
These organs will remain inactive until abscisic acid is destroyed or growth-promoting chemicals, particularly gibberellin, overcome them.
- Abscisic acid also regulates abscission or the separation of plant parts; it induces abscission of leaves, fruits, and flowers.
- So, the right answer is dormancy and leaf fall.
Final Answer :
Option B : Leaf fall and dormancy