MDCAT Biology MCQ #404

In the autumn, leaves turn yellow and orange because chlorophyll is broken down. Which accessory pigments are now primarily responsible for the leaf color?

MDCAT Biology MCQ #404

  1. Question 1

    Q1. In the autumn, leaves turn yellow and orange because chlorophyll is broken down. Which accessory pigments are now primarily responsible for the leaf color?

    • A) Phycobilins
    • B) Chlorophyll b
    • C) Xanthophylls
    • D) Carotenoids

    Answer: Carotenoids

    Explanation: Carotenoids become visible when chlorophyll degrades in autumn. Anthocyanins are wrong because they are not primarily involved in light absorption for photosynthesis.