Structure of Ovule or Megasporangium

• A ridge or stalk like out growth is formed from the placenta of the ovary on which body of ovules are present. Each ovule attached to the placenta by means of a thin stalk called funicle or funiculus/Funiculum.
• The point of attachment of the funicle with the ovule is called hilum.
• The main region of the ovule is composed by mass of parenchymatous cells called nucellus. Nucellus is the main part of ovule. The nucellus is covered by one or two coats called integ…

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Types of Ovules

There are six different types of ovules are found in Angiosperms on the basis of relationship of the micropyle, chalaza and hilum with body of the ovule and orientation on the funiculus.

• Atropous or Orthotropous: The body of ovule is upright in position. The micropyle, chalaza and hilum lie in one straight line so that this ovule is called straight or upright ovule. Example is Betel, Piper, Polygonum and in Gymnosperms. It is the most primitive and most simpl…

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