Ovaries with the following placentations are always one chamberedA. Marginal placentationB. Free central placentationC. Parietal placentationD. Basal placentation.

In Marginal, Free central and Basal placentations, ovary is always one chambered. In Pairetal placentation, due to formation of false septa the ovary may become two or more chambered as in Brassicaceae, Papaveraceae and Cucurbitaceae.