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.
This enables the Union government to exercise control over the State administration.
The equality of units in a federation is best guaranteed by their equal representation in the Uppers House of the federal legislature (Parliament).
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.
But for the very clear picture of this conclusion first of all we have to know that what is the federal constitution and what is unitary constitution.
This is one of the federal features of the Indian constitution.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.