Question

Which of the following reverses the apical dominance?

• A. Auxin
• B. Cytokinin
• C. Gibberellin
• D. Abscisic acid

Hint:

Remember that auxin promotes apical dominance, while cytokinin reverses it by stimulating lateral bud growth.

Answer 1

The Correct Option is B

Apical dominance is the phenomenon where the apical bud inhibits the growth of lateral buds. It is primarily regulated by the hormone auxin, which is produced at the shoot tip. Cytokinin, however, acts in opposition to auxin and promotes the growth of lateral buds, thereby reversing apical dominance. Auxin maintains the dominance of the apical bud by suppressing the lateral bud growth. Cytokinin encourages cell division in the lateral buds, effectively overcoming the inhibitory effect of auxin. Thus, the hormone that reverses apical dominance is cytokinin.