Photoperiodism was first characterised in

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(A) : Photoperiodism is the physiological response of plants to the relative lengths of light and dark periods. It was first characterized by $W.W. Ga

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tobacco

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(A) : Photoperiodism is the physiological response of plants to the relative lengths of light and dark periods. It was first characterized by $W.W. Garner$ and $H.A. Allard$ $(1920)$ in tobacco plants. They observed that the $Maryland$ $Mammoth$ variety of tobacco could be induced to flower during the summer season by artificially reducing the duration of light exposure.

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