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You need to remember that there are 3 classes of pigments and the class of carotenoids is also called accessory pigments class.
The colors of carotenoids are usually red, yellow, orange or brown, in case of fucoxanthin.
Though carotenoids capture the energy of sunlight, they are not able to give away the captured energy to photosinthesys process, hence carotenoids need to transfer this energy to chlorophylls pigments.
The carotenoids provide the fat-soluble vitamin A, an antioxidant nutrient that helps to protect the cell against the attacks of free radicals.
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