Which of the following plant hormone substitutes for long photoperiods in flowering plants?
A
Auxins
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B
Gibberellins
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C
Cytokinins
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D
Ethylene
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Solution
The correct option is B Gibberellins Photoperiodism is the ability of plants and animals to measure environmental day length to ascertain the time of year. The GA-induced bolting in rosettes is exploited commercially to induce early production of seeds. When a cabbage head is kept under warm nights, it retains its rosette habit. Bolting can be induced artificially by the application of gibberellins under normal conditions.