Assertion : Photomodulation of flowering is a phytochrome -...

Flowering is a phytochrome regulated process. Phytotchrome is a blue protein pigment with a molecular mass of about $125 \mathrm{k} \mathrm{Da}$ (kilodaltons). Phytochrome occurs in two interconvertible form $P_R$ (which absorbs red light)$and \mathrm{P}_{\mathrm{fr}}$ (which absorbs far red light). The studies with mutants of Arabidopsis support and prove that the $\mathrm{P}_{\mathrm{fr}}$ is the active form of phytochrome. When $\mathrm{P}_{\mathrm{R}}$ molecules are exposed to red light, most of them absorb it and converted to $\mathrm{P}_{\mathrm{fr}}$. This causes floral induction in the shoot.