Which plant hormone is primarily responsible for inducing apical dominance by suppressing lateral bud outgrowth?
Answer and explanation
Correct answer: B. Auxin (Indole-3-acetic acid)
- Step 1: Auxin is synthesized primarily in the shoot apical meristem and transported basipetally. Step 2. High apical auxin concentrations inhibit the outgrowth of axillary lateral buds, maintaining apical dominance. Answer: Auxin (Indole-3-acetic acid). Why not the others: Gibberellins promote stem elongation and seed germination; Cytokinins promote lateral bud outgrowth (antagonizing auxin); Abscisic acid mediates dormancy and drought stress.
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