Assertion: Phytochrome exists in two form `P_(r)` and `P_("fr")` form inhibit flowering.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion.
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If the assertion and reason is false but reason is true

Answer

C

Explanation

( C) Light energy become effective when it is absorbrd by a pigment. These pigments are called phytovhromes. It occurs in two forms namely`P_(r) "and " P_(fr)`. The two forms are interconvertible. The `P_(r)` form absorbs red light of 600 nm and changed `P_("fr")`. The `P_("fr")` from absorb far red light of 730 nm and changed to `p_(r)`. The `P_(r)`from stimulates whereas `P_("fr")` from inhibit flowering. `P_("fr")` from of phytochrome is the active from. The `P_(r)`from is not considered to be active.