Correct Answer is 7th Amendment Explanation & Key Takeaways: 7th Constitutional amendment act(1956): • Abolishing the previous classification of state into four categories. • Extended the jurisdiction of high courts to union territories. • Provided for the establishment of a common court for 2 or more states. • Provided for the appointment of additional acting judges of the high court. Related Concepts: 1st Constitutional amendment act(1951): • It was crucial in facilitating land reforms in India. • Added Article 31A and Article 31B to protect laws related to the acquisition of estates and other land reforms from judicial scrutiny. • Empowered the state to make special provisions for the advancement of socially and economically backward class. • Provided for the saving of laws providing for the acquisition of estate, etc. • Added the ninth schedule to protect the land reform and other laws included in the form of the judicial review. • Added three more grounds of restriction on freedom of speech and expression viz, public order, friendly relation with foreign states, and incitement to an offense. It also made the restriction reasonable and thus justiciable. • Provided that the state trading and nationalization of any trade or business by any state is not to be invalid on the ground of violation of the right to trade or business. 13th Constitutional amendment act(1962): • Gave the status of state to Nagaland and made a special provision for it. 9th Constitutional amendment act(1960): • It primarily dealt with the re-adjustment of the boundaries between India and Pakistan. • Facilitate the cession of the Berubari union.