Gibberellin

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1. Plant hormone that influences cell elongation, photoperiod (photoperiodism) response, and chilling tolerance.

220px-The_effect_of_Gibberellins.svg.png

1. Shows a plant lacking gibberellins and has an internode length of "0" as well as it is a dwarf plant.
2. Shows your average plant with a moderate amount of gibberellins and an average internode length.
3. Shows a plant with a large amount of gibberellins and so has a much longer internode length because gibberellins promotes cell division in the stem.

Source: https://en.wikipedia.org/wiki/Gibberellin