Question

why we have a integrated judiciary in india

Answer 1

India's Judicial System is pyramidal in nature. 

At the apex of country's judicial system is the Supreme Court which is supreme guardian of the law of the land, comprising of chief justice and other 25 judges.

There are High Courts at the state level which have jurisdiction over a state, or a Union territory or a group of states or union Territories.

Then there are District courts which are established by the State governments which have authority over district or a group of districts.

We have subordinate courts in districts which are of civil and criminal in nature.Gram Nayayalyas have also been established at Panchayat level from 2008.
In India, Supreme Court is the highest court of appeal, which hear cases that comes as an appeal from the High Courts. The Supreme Court's decisions are binding on all other courts of the country.  
Like wise, the Constitution has also defined the appellate jurisdiction of the High Courts as well which hear cases as an appeal from district courts and district courts hear cases that come as an appeal from subordinate courts. This is why we say that we have an integrated judicial system.

Answer 2

. All the courts at different levels in a country put together are called the Judiciary.

. The Indian Judiciary consists of a Supreme Court for the entire nation.

. High courts on the states, District Courts and the courts at local level.

. India has an integrated Judiciary.

. It means the Supreme court controls the Judicial administration in the country.