Union Territories & Panchayats
(1) Unless Parliament provides otherwise by law, every Union territory is administered by the President, acting through an administrator he appoints with whatever designation he specifies. (2) Notwithstanding Part VI, the President may appoint a State's Governor as administrator of an adjoining Union territory, in which case the Governor acts as administrator independently of their State Council of Ministers.
Unlike States (which have their own elected governments), Union Territories are directly administered by the central government through an appointed administrator - there's no automatic right to an elected state-style government. Some Union Territories are given administrators with special titles (like "Lieutenant Governor"), and sometimes a neighbouring state's own Governor doubles as a UT's administrator.
This is the constitutional basis for why a Union Territory like the Andaman and Nicobar Islands is run by a Lieutenant Governor appointed by the central government, rather than by an elected Chief Minister the way a full State is.