What is the action spectrum of photoperiodism?

430 and 660 nm

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640 and 660 nm

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660 and 730 nm

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700 and 900 nm

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Solution

The correct option is C 660 and 730 nm
Photoperiodism is exhibited by plants due to the presence of phytochromes. They are of two types: P660 and P730. Thus, the range of wavelength varies between 660 and 730nm

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