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B
Garner and Allard
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C
F. F. Blackman
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D
Borthwick and Hendricks
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Solution
The correct option is D Borthwick and Hendricks Phytochrome are pigments involved in photoperiodism and a variety of photoresponses. In 1940, Borthwick, Parker and Hendricks built the Beltsville spectrograph and discover phytochrome.