What are some of the significant changes that have occurred in the administration of Union Territories since 1956?
The significant changes that have occurred in the administration of Union Territories since 1956 include:

1. In 1956, with the Constitution (Seventh Amendment) Act, Part VIII was revised, and the heading "THE STATES IN PART C OF THE FIRST SCHEDULE" was substituted by "THE UNION TERRITORIES". This marked a shift in focus towards the administration of Union Territories.
2. In 1962, with the Constitution (Fourteenth Amendment) Act, Article 239A was inserted. This allowed Parliament to create local legislatures or Council of Ministers or both for certain Union Territories, providing more autonomy and representation in their administration.
3. In 1987, with the Goa, Daman and Diu Reorganisation Act, Article 239A was further amended to apply to the newly created Union territory of Daman and Diu, expanding its scope.
4. In 2006, with the Pondicherry (Alteration of Name) Act, the name "Puducherry" was substituted for "Pondicherry", further modifying the administration and representation of that Union Territory.
5. In recent years, some territories have been reorganized or upgraded to full-fledged states, such as the creation of Telangana in 2014 from parts of Andhra Pradesh.