Question

Which of the following is antagonistic to auxin in controlling apical dominance?

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

Answer 1

The correct option is C Cytokinin

In higher plants, the growing apical bud inhibits the growth of the lateral (axillary) buds, a phenomenon called apical dominance brought about by the phytohormone auxin.
Cytokinins are synthesised in regions where rapid cell division occurs such as, root apices, developing shoot buds and young fruits. It helps to produce new leaves, chloroplasts in leaves, lateral shoot growth and adventitious shoot formation; so cytokinins help overcome the apical dominance.