Question

y indian constitution is called the bag of borrowing?

Answer 1

It is called so Because the Indian Constitution has borrowed many provisions from other countries

Answer 2

the indian constitution is a result of inspiration from many other constitutions of world countries and  so it is called as bag of borrowings .list of some borrowings:
 1.fundamental rights = US
 2.directive principles of state policy = IRISH CONSTITUTION
 3.parliament = BRITAIN
 4.preamble = BRITAIN