reproductive structure - the parts of a plant involved in its reproduction

chalaza - basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined

nucellus - central part of a plant ovule; contains the embryo sac

micropyle - minute opening in the wall of an ovule through which the pollen tube enters

amphitropous ovule - a partly inverted ovule turned back 90 degrees on its stalk

anatropous ovule - a completely inverted ovule turned back 180 degrees on its stalk

campylotropous ovule - a curved ovule with the micropyle almost touching the funiculus

orthotropous ovule - a completely straight ovule with the micropyle at the apex

seed - a mature fertilized plant ovule consisting of an embryo and its food source and having a protective coat or testa

egg cell, ovum - the female reproductive cell; the female gamete