Why do daffodils have modified leaves at the base?

The cup or Trumpet of the daffodil is called a corona, which means "crown". At the base of the flower are 6 floral leaves called the perianth, which means "around the flower". These leaves unite into a tube giving the daffodil its characteristic shape. The back 3 leaves are called sepals and the inner 3 are petals. The shape and color of the daffodil draws in specific pollinators to the reproductive area of the flower.