In India, there is a parliamentary form of government. The majority party in the Lower House (Lok Sabha) forms government. The Council of Ministers is responsible to the Lok Sabha. The Cabinet is the real executive head. In Presidential form of government, the President is the executive head. In India, the President is only the nominal head.
In Britain, the monarchy is hereditary. But in India, the post of President is elective our founding fathers adopted the parliamentary model for two reasons. Firstly, they believed that a parliamentary form of government would be more responsible democratic than the presidential form of government.
Secondly, they were, to so extent, familiar with the parliamentary form of government during the British rule particularly after the implementation of the Government of India Act, 1935.