Question

Explain the different types of placentation with example.

Answer 1

The different types of placentation with example :

1. Marginal: It is with the placentae along the margin of a unicarpellate ovary. Example: Fabaceae.
2. Axile: The placentae arises from the column in a compound ovary with septa. Example: Hibiscus, tomato and lemon.
3. Superficial: Ovules arise from the surface of the septa. Example: Nymphaeceae.
4. Parietal: It is the placentae on the ovary walls or upon intruding partitions of a unilocular, compound ovary. Example: Mustard, argemone and cucumber.
5. Free – central: It is with the placentae along the column in a compound ovary without septa. Example: Caryophyllaceae, Dianthus and primrose.
6. Basal: It is the placenta at the base of the ovary. Example: Sunflower (Asteraceae) Marigold.