These carrots are an example of modified roots of a plant. The carrot is actually a very large taproot. The taproot helps store food in the form of carbohydrates like starch. Carrots, sugar beets, turnips and other plants have evolved to grow underground for protection and to take advantage of the all the nutrients within the soil. Not shown in the picture are the smaller secondary roots that grow outward, they have been cut out for a more appealing and appetizing look.