What is the difference between a unitary and federal constitution ?
Constitutions are either unitary or federal. A unitary system is governed constitutionally as one single unit, with one constitutionally created legislature.
This means that all powers of the Government are centralized in one Government that is Central Government. The most famous example of Unitary Constitution is UK.
In Unitary Constitution the provinces are subordinate to the centre, but in federal constitution , there is a division of powers between the federal and the state governments. Both are independent in their own sphere. Constitution of India has features of both unitary and federal constitution.