Phytochrome becomes active in

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(C) Phytochrome is a photoreceptor pigment that exists in two interconvertible forms: $Pr$ (inactive form) and $Pfr$ (active form).$Pr$ absorbs red li

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Red light

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(C) Phytochrome is a photoreceptor pigment that exists in two interconvertible forms: $Pr$ (inactive form) and $Pfr$ (active form).$Pr$ absorbs red light (wavelength $660 \ nm$) and gets converted into the active $Pfr$ form.$Pfr$ absorbs far-red light (wavelength $730 \ nm$) and gets converted back into the inactive $Pr$ form.Therefore,phytochrome becomes active in the presence of red light.

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