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(B) Photoperiodism is the physiological response of plants to the relative lengths of light and dark periods.It is associated with the synthesis of a

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Florigen

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(B) Photoperiodism is the physiological response of plants to the relative lengths of light and dark periods.It is associated with the synthesis of a hypothetical flowering hormone known as $Florigen$.$Florigen$ is produced in the leaves and then translocated to the shoot apical meristem,where it induces the transition from vegetative growth to reproductive growth (flowering).

Photoperiodism is associated with the formation of

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