Which growth regulator is typically used to shorten plant height?

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Multiple Choice

Which growth regulator is typically used to shorten plant height?

Explanation:
Shortening plant height hinges on limiting the signal that tells stems to elongate, which largely comes from gibberellins. A growth regulator that blocks GA production reduces internode length, giving a shorter, more compact plant. B-Nine does exactly that: it inhibits gibberellin biosynthesis, so stem elongation slows and height is reduced. The other options either promote growth (gibberellic acid drives elongation) or affect other processes (auxin can influence growth in various ways, abscisic acid relates to dormancy and stress responses) and aren’t used primarily to shorten height.

Shortening plant height hinges on limiting the signal that tells stems to elongate, which largely comes from gibberellins. A growth regulator that blocks GA production reduces internode length, giving a shorter, more compact plant. B-Nine does exactly that: it inhibits gibberellin biosynthesis, so stem elongation slows and height is reduced. The other options either promote growth (gibberellic acid drives elongation) or affect other processes (auxin can influence growth in various ways, abscisic acid relates to dormancy and stress responses) and aren’t used primarily to shorten height.

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