explain why carrots look orange
Look?
I just cooked some white carrots yesterday. Carrots several hundred years ago were mostly purple, white, and yellow. Then a king (Wm of Orange) took the throne, and the Dutch selected out all the great carrots, and bred the orange one which we have today.
Why carrots appear orange is the high content of Beta Carotene, which is a molecule high in certain vitamin precursors, and has the characteristic of making the "orange" color (really it is a mixture of red and yellow. See http://www.foodcolor.com/beta-carotene-color
Now if you want to see the purple carrot , click on the above link on the "black carrot color".
Don't believe it when your teacher tells you carrots are orange. We chemists know better. See below https://img0.etsystatic.com/000/0/6221434/il_340x270.236641536.jpg