Final answer:
A complete flower consists of four whorls of parts: the calyx, corolla, androecium, and gynoecium. If any of these parts are missing, the flower is incomplete. Complete flowers can also be perfect, androgynous, or hermaphroditic if they have both male and female reproductive structures.
Step-by-step explanation:
A complete flower contains four whorls of parts: the calyx (comprised of sepals), the corolla (comprised of petals), the androecium (male reproductive organs, including stamens with anthers that produce pollen), and the gynoecium (female reproductive organs, including the carpels with a stigma, style, and ovary housing the ovules). If any of these whorls are missing, the flower is referred to as incomplete. Plants showing flowers with both androecium and gynoecium are called perfect, androgynous, or hermaphrodites. Staminate flowers contain only an androecium, whereas carpellate flowers have only a gynoecium.
A complete flower comprises four whorls of parts: the calyx, corolla, androecium, and gynoecium. An incomplete flower is missing one or more of these whorls.