. Abscisic acid controls

A: Cell division

B: Leaf fall and dormancy

C: Shoot elongation

D: Cell elongation and wall formation


Best Answer

Explanation : 

  • 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


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