In Indian constitution the powers of state and centre are clearly defined and there are very clear limits of both the centre and the state for law making powers. The State List consists of 66 subjects of local interest such as Public Health, Police etc.
The Concurrent List has 47 subjects important to both the Union and the State such as Electricity, Trade Union, Economic and Social Planning, etc.
The federal polity, in other words, provides a constitutional device for bringing unity in diversity and for the achievement of common national goals. A federal government exists when the powers of the government for a community are divided substantially according to a principle that there is a single independent authority for the whole area in respect of some matters and there are independent regional authorities for other matters, each set of authorities being co-ordinate to and subordinate to the others within its own sphere.
The Constitution of India has adopted federal features; though it does not, in fact, claim that it establishes a federation.
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.
The procedure of amending the Constitution in a federal system is normally rigid.