Which of these is/are called accessory pigment(s)?
Chlorophyll b
Carotene
Xanthophyll
Chlorophyll a, chlorophyll b, carotene and xanthophyll are different pigments found in a chloroplast. Among these, only chlorophyll a can participate directly in photosynthesis. All other pigments absorb light and transfer it to chlorophyll a. Hence, they are called accessory pigments.