Practice question
Question
Which family shows bicarpellary syncarpous ovary with parietal placentation?
Explanation
Brassicaceae gynoecium is bicarpellary, syncarpous, superior but exhibits parietal placentation where ovules arise on periphery of originally unilocular ovary. During development a false septum replum arises from placenta ingrowth, dividing ovary into bilocular chamber in fruit siliqua or silicula. Swollen placenta bears numerous ovules in two rows. Solanaceae shows axile placentation with swollen placenta, Fabaceae marginal on single suture, Liliaceae tricarpellary axile. Cruciferous condition with tetradynamous stamens K2+2 C4 cruciform corolla corroborates Brassicaceae identification and explains characteristic dehiscence leaving replum persistent after valve fall.