Which of the following plant hormone substitutes for long photoperiod in flowering plants?

Auxin

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Gibberellins

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Cytokinin

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Ethylene

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Solution

The correct option is B Gibberellins
Gibberellins affect several reproductive processes in plants. They stimulate flowering, particularly in long-day plants. In addition, gibberellins substitute for the low temperature that biennials require before they begin flowering. If gibberellins are applied to biennials during their first year of growth, flowering occurs without exposure to a period of low temperature.
Thus, the correct answer is option B.

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