What is the action spectrum of photoperiodism [BHU 1982] – McqOptions

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1.	What is the action spectrum of photoperiodism [BHU 1982]
A.	430 and 660 nm
B.	640 and 660 nm
C.	660 and 730 nm
D.	700 and 900 nm
Answer» D. 700 and 900 nm

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