Most important character of Brassica campesteris is
Brassica campesteris, commonly known as field mustard is the species of an economically important family of flowering plants i.e., Brassicaceae or Cruciferae. In Brassicaceae, the gynoecium is bicarpellary, syncarpous, ovary superior, unilocular, becomes bilocular due to the development of false septum called replum. Hence, most important character of Brassica campesteris is false septum. So, the correct answer is 'False septum'.