Assertion: Photomodulation of flowering is a phytochrome - regulated process.
Reason: Active form of phytochrome (Pfr) directly induces floral induction in shoot buds.
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false.
C.
If Assertion is true but Reason is false
Phytochrome regulates flowering in plants. Phytotchrome is a blue protein pigment with a molecular mass of about 125 k Da (kilodaltons).
Phytochrome occurs in two interconvertible form
PR (which absorbs red light) and Pfr (which absorbs far red light). The studies with mutants of Arabidopsis support and prove that the Pfr is the active form of phytochrome. When PR molecules are exposed to red light, most of them absorb it and converted to Pfr This causes floral induction in the shoot.
