Pigments in Plants:
* Carotenoids: These pigments are responsible for the orange, yellow, and red colors in many fruits, vegetables, and leaves. They absorb blue and green light, reflecting yellow, orange, and red.
* Anthocyanins: These pigments create the vibrant reds, purples, and blues found in fruits, flowers, and some leaves. They absorb green and yellow light, reflecting red, purple, and blue.
* Betalains: Found in beets and other plants, these pigments produce reds and yellows.
Pigments in Animals:
* Melanin: Responsible for brown and black coloration in animals, melanin absorbs all wavelengths of light, making it appear black.
* Carotenoids: Animals can also obtain carotenoids through their diet, leading to yellow, orange, and red coloration in birds, fish, and crustaceans.
* Pterins: These pigments create yellow and orange hues in insects, birds, and fish.
* Bilins: Found in bile, these pigments give a greenish-yellow color to some animals.
Other Molecules:
* Structural Coloration: Some animals and plants achieve color through physical structures rather than pigments. For example, the iridescent colors of butterfly wings are due to the way light interacts with tiny scales on their surface.
* Fluorescent Molecules: These molecules absorb one wavelength of light and emit another, often at a longer wavelength, giving off a glowing effect.
Understanding Absorption and Reflection:
The color we perceive is the light that is *reflected* back to our eyes. When a molecule absorbs a specific wavelength of light, it means that energy from that wavelength is absorbed by the molecule. The wavelengths that are not absorbed are reflected.
Why is this important?
The ability of molecules to absorb and reflect light has a wide range of implications:
* Photosynthesis: Chlorophyll absorbs red and blue light, providing energy for photosynthesis in plants.
* Camouflage: Animals use coloration to blend into their environment.
* Communication: Birds use vibrant colors to attract mates.
* Protection: Pigments can protect plants from UV radiation.
The world around us is a symphony of colors, and understanding how different molecules interact with light is crucial for appreciating its beauty and function.
