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(A) Phytochrome is a proteinaceous pigment that acts as a photoreceptor in plants. It exists in two interconvertible forms: $Pr$ (which absorbs red li

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Phytochrome

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(A) Phytochrome is a proteinaceous pigment that acts as a photoreceptor in plants. It exists in two interconvertible forms: $Pr$ (which absorbs red light) and $Pfr$ (which absorbs far-red light). It plays a crucial role in various light-mediated developmental processes such as photoperiodism,seed germination,and stem elongation,making it the central pigment for light-related activities.

The proteinaceous pigment that acts as the center of activities concerned with light is:

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