Bony plate separating the nasel passages from the mouth?

The bony plate that separates the nasal passages from the mouth is called the hard palate. It is formed by the palatine processes of the maxillae and the horizontal plates of the palatine bones. The hard palate plays a crucial role in separating the oral cavity from the nasal cavity, aiding in functions such as chewing and speech. It also supports the teeth and provides structural integrity to the roof of the mouth.