Assertion: Phytochrome exists in two forms `P_(r)` and `P_("fr")`
Reasons : `P_(r) `form stimulates 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

A

Explanation

(a) Phototropism is a paratonic directional growth movement of curvature which is inducel and determind by the direction of light stimulus. Shoots grow towards the source of light hence called positively phototropic while roots grow away from the source of light hence called negatively phototropic.