Q.

Photoperiod was first observed in
 a) Potato            b) Maryland mammoth                             c) Four O’clock                  d)    Evening primrose

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A.

(b) Garner and Allard (1920) firstly observed photoperiod in ‘Maryland’ Mammoth’. A variety of tobacco could be made to flower in summers by reducing the amount of light hour along with artificial darkening. It could be made to remain vegetative in winters by proving extra light

 



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