Solution:
Fucoxanthin is main pigment in Phaeophyceae , it is a xanthophyll that contributes more than 10% of the estimated total production of carotenoids in nature. It is an accessory pigment found in the chloroplasts of many brown macroalgae, such as Fucus spp., and the golden-brown unicellular microalgae(diatoms). Fucoxanthin is main pigment .
