Define Placentation & mention their types.

Explanation

The mode of distribution of placenta inside the ovary is called placentation. Placenta bears the ovules.
Different types as follows :
1. Marginal : It is with the placentae along the margin of a unicarpellate ovary . Eg : Fabaceae.
2.
Axile : The placentae arises from the column in a compound ovary with septa. Eg: Hibiscus, tomato, lemon.
3. Superficial : Ovules arise from the surface of the septa.
Eg: Nymphaeaceae .

4. Parietal : It is the placentae on the ovary walls or upon intruding partitions of a unilocular, compound ovary . Eg: Mustard, Argemone, cucumber.

5.Basal : It is the placenta at the base of the ovary . Eg: Sunflower , Marigold.
6. Free - central : It is with the placentae along the column in a compound ovary without septa. Eg: Caryophyllaceae, Dianthus, Primrose.