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Question

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.
So, the correct answer is option B.

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