The photoreceptor that absorbs blue light and triggers a phototropic response is

A) phototropin.
B) phytochrome.
C) jasmonate.
D) systemin.
E) zeatin.

Phototropin

A protein that acts as a blue-light receptor, causing phototropic responses in plants towards light sources.

Phototropic Response

the growth or movement of a plant organ toward or away from light, as a response to its direction.

Phytochrome

A blue-green, proteinaceous pigment involved in a wide variety of physiological responses to light; occurs in two interconvertible forms, Pr (red-absorbing phytochrome) and Pfr (far-red-absorbing phytochrome).