Multiple choice

The phytohormone, which influences apical dominance growth is

  1. IAA

  2. ABA

  3. GA3

  4. C2H4
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A Correct answer
Explanation

IAA (Indole-3-Acetic Acid), the natural auxin, is primarily responsible for apical dominance - where the main shoot tip suppresses lateral bud growth. ABA (abscisic acid) is a stress hormone, GA3 promotes elongation and flowering, and C2H4 is ethylene (ripening hormone).

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