(D) Phytochrome is a pigment that exists in two interconvertible forms: $P_r$ and $P_{fr}$.$P_r$ absorbs red light $(660 \ nm)$ and is converted into

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(D) Phytochrome is a pigment that exists in two interconvertible forms: $P_r$ and $P_{fr}$.$P_r$ absorbs red light $(660 \ nm)$ and is converted into $P_{fr}$.$P_{fr}$ absorbs far-red light $(730 \ nm)$ and is converted back into $P_r$.Therefore,phytochrome is sensitive to both red and far-red light.