Megasporangium (Ovule):-

• It is a small structure attached to the placenta by means of a stalk (funicle). The junction where the body of the ovule and the funicle fuse is called the hilum.
• Each ovule has one or two protective envelopes called integuments. Integuments encircle the ovule except at the tip, where a small opening (micropyle) is organized.
• Opposite the micropylar end is the chalaza (basal part of the ovule).
• Enclosed within the integuments, there is a mass of cells called nucellus. Its cells contain reserve food materials.
• Located in the nucellus is the embryo sac (female gametophyte). An ovule generally has a single embryo sac formed from a megaspore through meiosis.