Effective from 1950, the Constitution of India classified the constituent units of India into three classes—Part A, B, and C states. The former British provinces, together with the princely states that had been merged into them, were the Part A states. The princely unions, plus Mysore and Hyderabad, were the Part B states. The former Chief Commissioners' Provinces and other centrally administered areas, except the Andaman and Nicobar Islands, were the Part C states. The only practical difference between the Part A states and the Part B states was that the constitutional heads of the Part B states were the Rajpramukhs appointed under the terms of the Covenants of Merger, rather than Governors appointed by the central government. In addition, Constitution gave the central government a significant range of powers over the former princely states, providing amongst other things that "their governance shall be under the general control of, and comply with such particular directions, if any, as may from time to time be given by, the President". Apart from that, the form of government in both was identical.