The term photoperiodism was proposed by
or
The phenomenon of photoperiodism in plants was discovered by

Lysenko and Thimman

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Blackman and Skoog

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Garner and Allard

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Chailakhyan and Borthwick

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Solution

The correct option is C Garner and Allard
The effect of photoperiod on flowering was discovered by Garners and Allard at USA in 1920 in case of Maryland mammoth variety of Tobacco, which is an SDP. Photoperiodism is the physiological reaction of organisms to the length of day or night. It occurs in plants and animals. It can also be defined as the developmental responses of plants to the relative lengths of light and dark periods.

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