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(D) Phytochrome is a light-sensitive pigment found in plants that exists in two interconvertible forms: $P_r$ (red light-absorbing) and $P_{fr}$ (far-

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Phytochrome

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(D) Phytochrome is a light-sensitive pigment found in plants that exists in two interconvertible forms: $P_r$ (red light-absorbing) and $P_{fr}$ (far-red light-absorbing).It acts as a photoreceptor that regulates various developmental processes in plants,including seed germination,stem elongation,leaf expansion,and floral induction (flowering) in response to photoperiodic signals.Therefore,it is the pigment responsible for both floral induction and seed germination.

$A$ pigment concerned with both floral induction and seed germination is

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