It has been the matter of debate among the scholars that whether the constitution of India is completely federal or unitary in nature.But actually Indian constitution contains both features of a federal constitution and unitary constitution.The following provision of Indian constitution makes it unitary Article I of the Constitution describes India as a ‘Union of States’, which implies two things: firstly, it is not the result of an agreement among the States and secondly, the States have no freedom to secede or separate from the Union.Besides, the Constitution of the Union and the States is a single framework from which neither can get out and within which they must function.However, this is not applicable in case of Indian States.
The Constitution of India has adopted federal features; though it does not, in fact, claim that it establishes a federation.
Supremacy of judiciary is another very important feature of a federal state where there is an independent judiciary to interpret the Constitution and to maintain its sanctity.
The Supreme Court of India has the original jurisdiction to settle disputes between the Union and the States.
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.
However, in addition to this process, some amendments must be approved by at least 50% of the states.