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Cell elongation in internodal regions of the green plants takes place due to

1. indole acetic acid
2. cytokinins
3. gibberellins
4. ethylene

Correct answer: gibberellins

Solution

Gibberellins stimulate cell elongation and division in stems, especially in internodal regions, leading to increased shoot length. They are the classic hormones associated with stem elongation and bolting.

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