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Why Do Leaves Change Color in Fall?

Why Do Leaves Change Color in Fall?

秋天树叶为什么会变色?

  1. In spring and summer, leaves are green.
  2. They make food using sunlight, water, and air.
  3. Green color comes from chlorophyll inside leaf cells.
  4. When days get shorter, trees stop making chlorophyll.
  5. Other colors like yellow and orange were always there.
  6. They just could not be seen under the green.
  7. Some leaves even make red pigments before falling.
  8. Then the leaves dry up and fall to the ground.
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