- Sex ratio is defined as the number of females per 1000 males in a population. - According to Census 2011 data for the given states: - Meghalaya: 989 - Manipur: 985 - Mizoram: 976 - Tripura: 960 - Arranging these states in descending order of sex ratio (highest to lowest): 989 (Meghalaya) > 985 (Manipur) > 976 (Mizoram) > 960 (Tripura). - The correct order is Meghalaya—Manipur—Mizoram— Tripura.