Which one of the following is not a carotenoid?

Explanation

Carotenoids are accessory pigments that have several important roles, including protecting chlorophyll from damage, transferring energy to chlorophyll, and protecting human eyes by absorbing blue light. However, they do not directly convert light energy into chemical energy; this function is primarily performed by chlorophyll and the photosystems within chloroplasts. Thus, the correct answer is the option that states carotenoids do not convert light energy into chemical energy.