Why Are Leaves Green?

Why Are Leaves Green?

  • Leaves are green because the plant’s cells are filled with a green chemical called chlorophyll. Chlorophyll is vital to a plant’s survival as it’s used to absorb energy from sunlight.
  • When light shines on an object, the object will absorb most colors of light while reflecting only some.
  • The light that is reflected travels into our eyes, and we observe the object as being that color.
  • For example, a strawberry absorbs all but the very shortest wavelengths of light. This light is reflected, so the strawberry appears red.
  • Red light is the most useful to plants as they grow, so the chlorophyll absorbs it. Green light is not useful to plants, so it is reflected.
  • Because the green light is what reflects off the surface of the plant and travels back to our eyes, it is the color we see when we look at a plant.

Object Colour looks black to our eyes in case no colour is reflected. If an object is white it reflects all light.

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