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Question

The minimum length of the day or photoperiod required to induce flowering in a plant is called its .

A
photoperiodism
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B
critical day length
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C
vernalisation
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D
critical dark length
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Solution

The correct option is B critical day length
The minimum length of day or light period or photoperiod required to induce flowering in a plant is called its critical day length. The criritcal day length is specific for each species. Some plants require the exposure of light for a period exceding critical day length (long day plants) while others require less than critical day length (short day plants).

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