Elongation of internode is caused by

Ethylene

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Gibberellin

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Abscisic acid

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Cytokinin

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Solution

The correct option is B Gibberellin
Ethylene helps in parthenocarpy. Gibberellin is a growth promoter hormone which is produced by the mevalonic acid as the precursor. It helps in the elongation of the internode and breaks the dormancy of seed. Abscisic acid is an antitranspirant and induces seed dormancy. Cytokinin mainly helps in cell differentiation and cell division. So, the correct answer is option B.

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