confusion about two exchanges in india i.e NSE & BSE

#1
Why we have 2 stock exchange in india?
we can have 1 stock exchange in india but we have 2 i.e. BSE and NSE. why ?
I have seen many companies in both stock exchange. two exchange means two market cap. if we join this two exchange then our market cap would be on 5th place,
en.m.wikipedia.org/wiki/List_of_stock_exchanges
plus we will get higher volume for trading. in its simplest way can anybody explain why we have two exchange.
 

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