Why Will a Flower Wither if You Damage All Its Leaves?

Some boys and girls like flowers, but do not appreciate leaves. They would like to take away all the leaves and leave only the flower. By doing so they might have thought they helped the flowers grow to be more lovely but on the contrary, the flowers would soon wither. Why is this the case? Leaves have chlorophyll. With the help of the sunlight, it produces nutrients needed for the growth of the flowers. Without leaves the flowers, having lost the means to produce the nutrients, would certainly wither.