Bolting does not require

Short days

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Long days

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Internode elongation in rosette plants

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Cold nights

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Gibberellin application

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Solution

The correct option is A Short days
The rapid internode and stem elongation of rosette plant is called bolting. Bolting needs either long days or cold nights. However, bolting can be induced artificially by the application of gibberellin under normal conditions. Gibberellin is a plant hormone which helps in longitudinal growth of stem.
Thus, the correct answer is 'Short days'.

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Gibberellins cause bolting and flowering in rosette plants

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