Garner and Allard have worked on

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(C) $W.W. Garner$ and $H.A. Allard$ conducted pioneering research on photoperiodism.They observed that the $Maryland$ $Mammoth$ variety of tobacco and

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Both $(a)$ and $(b)$

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(C) $W.W. Garner$ and $H.A. Allard$ conducted pioneering research on photoperiodism.They observed that the $Maryland$ $Mammoth$ variety of tobacco and the $Biloxi$ variety of soybean exhibited specific seasonal patterns in flowering based on the duration of light exposure.Therefore,they worked on both of these plant varieties to establish the concept of photoperiodism.

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