(A) Red light with a wavelength of $660 \ nm$ is necessary for the germination of positively photoblastic seeds. This process is mediated by the phyto

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(A) Red light with a wavelength of $660 \ nm$ is necessary for the germination of positively photoblastic seeds. This process is mediated by the phytochrome pigment system,where the $P_r$ form of phytochrome absorbs red light and converts into the active $P_{fr}$ form,which triggers germination.