[Campbell Biology P.903] The vibrant colors observed in autumn leaves are primarily due to: | Practice Question

The vibrant colors observed in autumn leaves are primarily due to:

  • A: Increased synthesis of dark green chlorophyll.
  • B: Accumulation of ethylene within the leaves.
  • C: Newly made red pigments and the visibility of pre-existing yellow and orange carotenoids.
  • D: The formation of a protective cork layer at the petiole base.

Explanation

The text states: 'The colors of autumn leaves are due to newly made red pigments as well as yellow and orange carotenoids see Concept 10.3 that were already present in the leaves and are rendered visible by the breakdown of the dark green chlorophyll in autumn.'