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B
Lysenko
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C
Arnon
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D
Garner and Allard
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Solution
The correct option is D Garner and Allard W. W. Garner and H. A. Allard discovered photoperiodism. Photoperiodism is the phenomenon in which physiological responses of plant like flowering depends on the length of daylight and dark that was critical. Depending upon the critical period of light, plants are either short day plants or long day plants.