Describe the following parts of a flower and their functions:
a) calyx - The calyx is the outermost whorl of the flower, consisting of sepals. Its main function is to protect the flower bud.
b) corolla - The corolla is the second whorl of the flower, made up of petals. Its main function is to attract pollinators.
c) pistil - The pistil is the female reproductive part of the flower, consisting of the stigma, style, and ovary. Its main function is to receive pollen and facilitate fertilization.
d) stamen - The stamen is the male reproductive part of the flower, consisting of the anther and filament. Its main function is to produce and release pollen.
e) receptacle - The receptacle is the base of the flower where all the other parts are attached. It provides support and holds the floral organs in place.