Pigments are a group of molecules that have the property of capture energy in the form of photons. Each pigment has the capacity to absorb some wavelengths and reflect others. The wavelength reflected is the one that gives the color to the tissue in which the pigment is present. In case of chlorophylls they reflects green wavelength and absorb blue and red wavelengths. So, if a tisuue contains clorophyll, it will has green colour. Because of that plants and green algae, has green colour.
