Which of the following is the best way of explaining why the leaves on a given tree are green?
  1. The molecules in the leaves absorb all visible light but strongly reflect green light.
  2. The molecules in the leaves absorb green light and reflect other visible light.
  3. The molecules are excited by external light sources, and their electrons emit green light when they are de-excited to a lower energy level within the molecules.
  4. The molecules glow with a characteristic green energy in order to balance the absorption of energy due to light and heat from their surroundings.
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OpenStax College Physics for AP® Courses, Chapter 30, Problem 9 (Test Prep for AP® Courses)

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This is College Physics Answers with Shaun Dychko. Leaves on a tree are green because molecules in the leaves absorb all the colors except green light and so that's reflected and so that is what we see since that is the color of light that's reflected from the leaf to our eyes; answer is (a).