The procedure of amending the Constitution in a federal system is normally rigid.Indian Constitution provides that some amendments require a special majority.This enables the Union government to exercise control over the State administration.

A unitary system is governed constitutionally as one single unit, with one constitutionally created legislature. A unitary state is a sovereign state governed as one single unit in which the central government is supreme and any administrative divisions (sub national units) exercise only powers that the central government chooses to delegate.

This is one of the federal features of the Indian constitution.

The federation is a union because it is indestructible and helps to maintain the unity of the country.

Art 155 and 156 provide that the Governor, who is the constitutional head of a State, is to be appointed by the President and stays only until the pleasure of the President The Centre may take over the administration of the State on the recommendations of the Governor or otherwise.

After this procedure the amendment is signed by the head of the state i.e; the President.

Since in India important amendments can be amended through this procedure Hence, Indian Constitution has been rightly called a rigid constitution. The Union List consists of 97 subjects of national importance such as Defence, Railways, Post and Telegraph, etc.The supremacy of the constitution means that both, the Union and the State Governments, shall operate within the limits set by the Constitution.And both the union government and the central government derive their powers from the constitution.: The constitution of India is a rigid constitution and this is one of the basic features of federal constitution.In a federal set up there is a two tier of Government with well assigned powers and functions.In this system the central government and the governments of the units act within a well defined sphere, co-ordinate and at the same time act independently. Wheare defines federal government as an association of states, which has been formed for certain common purposes, but in which the member states retain a large measure of their original independence.Such an amendment has to be passed by majority of total members of each house of the Parliament as well as by two-thirds majority of the members present and voting there in.