Question

placentation in which is obviously ball on the inner wall of the ovary are in paraffin far is​

Answer 1

Parietal placentation: In this type of placentation, the ovules develop on the inner wall of the ovary. Ovary has a single chamber but appears to be double-chambered because of the formation of a false septum. Example: Mustard and argemone.

and false septum in Mustard is also called a replum which grows during the process of dehiscence in fruits. It separates two valves of the fruit. The ovary is monolocular in the beginning but later it becomes bilocular. The presence of false septa is characteristic for the entire family Brassicaceae. It represents inward projections produced by the ovary wall which are only developed in the upper half of an ovary.