The hormone responsible for apical dominance is

IAA

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ABA

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Florigen

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Solution

The correct option is A IAA
Indole Acetic Acid IAA is a naturally produced hormone at the shoot tip by the apical bud that results in vertical growth of the stem, however, this inhibits the growth of lateral buds by preventing basipetal transportation of auxin. Which is termed as apical dominance.
So, the correct answer is 'IAA'

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