Question

Differentiate between: 

(i) Marginal and Axile placentation. 

(ii) Marginal and Parietal placentation.

Answer 1

(i) Marginal and Axile placentation.

S. No	Margina Placentation	Axile Placentation
(i)	Ovary is always unilocular.	Ovary is two or more locular.
(ii)	Ovary is simple or monocarpellary.	Ovary is compound and syncarpous.
(iii)	Ovules attached to wall of ovary.	Ovules attached to central/axile column.
(iv)	The ovule is found in a single file.	The number of ovule files are based on the number of fusing carpels or septa.

(ii) Marginal and Parietal placentation.

S. No.	Marginal Placentation	Pariental Placentaion
(i)	Found in monocarpellary or simple ovary.	Occurs in compound or syncarpous ovary.
(ii)	A single longitudinal placenta or file of ovules are attached to the ovary wall.	Two or more longitudinal placentae or files of ovules are attached to the ovary wall.
(iii)	Ovary is always unilocular.	Ovary can be unilocular, may become falsely two or more locular due to in growth of placentae formation of false septa.