| State | Description |
|---|---|
| I. Arunachal Pradesh | The capital is named after a fort, and the State has two National Parks |
| II. Nagaland | The State came into existence on the basis of a Constitutional Amendment Act |
| III. Tripura | Initially a Part 'C' State, it became a centrally administered territory with the reorganization of States in 1956 and later attained the status of a full-fledged State |
Pair I: Arunachal Pradesh
The capital of Arunachal Pradesh, Itanagar, is named after Ita Fort, a historical fort. The state is home to two National Parks: Namdapha National Park and Mouling National Park. Therefore, this pair is correctly matched.
Pair III: Tripura
Tripura initially merged with the Indian Union as a Part 'C' State on October 15, 1949. With the reorganization of states in 1956, it became a centrally administered territory (Union Territory). Subsequently, it attained full statehood on January 21, 1972, through the North Eastern Areas (Reorganisation) Act, 1971. Therefore, this pair is correctly matched.
Pair II: Nagaland
Nagaland was constituted as a state by the State of Nagaland Act, 1962, which was an Act of Parliament. While the 13th Constitutional Amendment Act, 1962, inserted Article 371A into the Constitution to provide special provisions for Nagaland, the creation of the state itself was primarily through a separate parliamentary act, not solely or directly on the basis of a Constitutional Amendment Act. Therefore, this pair is incorrectly matched.