Generally the appearance of a photosynthetic plants depends on the wave of light on the absorption spectrum that the pigments absorbs. Thus a leaf appears green at sight because the chlorophyll pigment absorbed wavelength of lights in red-blue-violet region, and reflect green back to the eyes.
Carotenoids appears as orange-yellow in color to eyes.Thus the plant in the question is a carotenoids. They usually absorbed light in blue-violet region of absorption spectrum. Therefore since this plant is a carotenoids, definitely it must absorbed in Blue-violet ,(400-550mn) and appear orange-yellow since it did not absorbed this but reflects back to eyes.
