Describe the various types of placentations found in flowering plants.

By Ritesh|Updated : November 14th, 2022

The various types of placentations are marginal placentation, axile placentation, parietal placentation, basal placentation, and free central placentation. It is described as how the ovules are arranged inside the ovary. In flowering plants, placentation can take a variety of forms.

Types of Placentation:

Marginal placentation:

  • Ovules are born in two rows on the placenta-formed ridge that crosses the ventral suture of the ovary.
  • Example: Pea

Axile placentation:

  • Ovules in a multilocular ovary are connected to the axial placenta.
  • Lemon is a good illustration.

Parietal placentation:

  • Ovules develop on the inner or outer wall of the ovary.
  • Initially single-chambered, it develops a fake septum to become two-chambered.
  • An illustration is a mustard.

Basal placentation:

  • The placenta forms at the base of the ovary and are connected to one ovule.
  • A good example is a marigold.

Free central placentation:

  • Ovules are born on the central axis because there are no septa.
  • One illustration is primrose.

Types of Placentation

Placenta:

The placenta serves as the link between the mother and the foetus. The placenta makes it easier for the foetus to receive oxygen and nutrients. Additionally, it is in charge of removing waste products and carbon dioxide from the foetus. The placenta is a disk-shaped organ that can grow up to 22 cm long. The placenta contains a lot of blood vessels as well.

Summary:

Describe the various types of placentations found in flowering plants.

Marginal placentation, axile placentation, parietal placentation, basal placentation, and free central placentation are among the different types of placentations. Placentation is the configuration of ovules within the ovary.

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