Final answer:
The pigment that absorbs blue and red light while reflecting green is chlorophyll a, giving plants their characteristic green color.
Step-by-step explanation:
The pigment that absorbs mostly blue and red light, and reflects green light is known as chlorophyll a. This pigment molecule is responsible for the common green color we associate with plants. Chlorophyll a uniquely absorbs light from the violet-blue and red parts of the visible spectrum, which leads to its green appearance, as the green wavelength is the one that is reflected. The absorption and reflection of distinct wavelengths of light by pigments like carotenoids and chlorophyll a and b, which each have their own absorption spectrum, are key to the coloration we observe in various plants and organisms.