What is placentation?

Placentation:

1. It is defined as the arrangement and attachment of ovules within the plant's ovary.
2. The ovules get attached via funicle, and the part of the ovary where ovules are attached is the placenta.

Types of placentation:

1. Axile placentation: When the placenta is placed axially as in a lemon, then such type of placentation is termed axile placentation.
2. Marginal placentation: When the placenta forms a ridge along the ventral suture as in pea, then this is known as marginal placentation.
3. Free central placentation: When the ovules are born on the central axis, it is called free central as in primrose.
4. Basal placentation: In this type of placentation, a single ovule is attached to the placenta and placed at the base of the ovary. Eg. Marigold.
5. Parietal placentation: In this type of placentation, the ovules develop on the inner wall or periphery of the ovary. Eg. Sunflower.